drivers/net/ethernet/sun/ldmvsw.c

   1 /* ldmvsw.c: Sun4v LDOM Virtual Switch Driver.
   2  *
   3  * Copyright (C) 2016 Oracle. All rights reserved.
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/delay.h>
   9 #include <linux/etherdevice.h>
  10 #include <linux/ethtool.h>
  11 #include <linux/highmem.h>
  12 #include <linux/if_vlan.h>
  13 #include <linux/init.h>
  14 #include <linux/kconfig.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/mutex.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/slab.h>
  20 #include <linux/types.h>
  21
  22 #if defined(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 /* This driver makes use of the common code in sunvnet_common.c */
  34 #include "sunvnet_common.h"
  35
  36 /* Length of time before we decide the hardware is hung,
  37  * and dev->tx_timeout() should be called to fix the problem.
  38  */
  39 #define VSW_TX_TIMEOUT                  (10 * HZ)
  40
  41 /* Static HW Addr used for the network interfaces representing vsw ports */
  42 static u8 vsw_port_hwaddr[ETH_ALEN] = {0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
  43
  44 #define DRV_MODULE_NAME         "ldmvsw"
  45 #define DRV_MODULE_VERSION      "1.0"
  46 #define DRV_MODULE_RELDATE      "Jan 15, 2016"
  47
  48 static char version[] =
  49         DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  50 MODULE_AUTHOR("Oracle");
  51 MODULE_DESCRIPTION("Sun4v LDOM Virtual Switch Driver");
  52 MODULE_LICENSE("GPL");
  53 MODULE_VERSION(DRV_MODULE_VERSION);
  54
  55 /* Ordered from largest major to lowest */
  56 static struct vio_version vsw_versions[] = {
  57         { .major = 1, .minor = 8 },
  58         { .major = 1, .minor = 7 },
  59         { .major = 1, .minor = 6 },
  60         { .major = 1, .minor = 0 },
  61 };
  62
  63 static void vsw_get_drvinfo(struct net_device *dev,
  64                             struct ethtool_drvinfo *info)
  65 {
  66         strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
  67         strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
  68 }
  69
  70 static u32 vsw_get_msglevel(struct net_device *dev)
  71 {
  72         struct vnet_port *port = netdev_priv(dev);
  73
  74         return port->vp->msg_enable;
  75 }
  76
  77 static void vsw_set_msglevel(struct net_device *dev, u32 value)
  78 {
  79         struct vnet_port *port = netdev_priv(dev);
  80
  81         port->vp->msg_enable = value;
  82 }
  83
  84 static const struct ethtool_ops vsw_ethtool_ops = {
  85         .get_drvinfo            = vsw_get_drvinfo,
  86         .get_msglevel           = vsw_get_msglevel,
  87         .set_msglevel           = vsw_set_msglevel,
  88         .get_link               = ethtool_op_get_link,
  89 };
  90
  91 static LIST_HEAD(vnet_list);
  92 static DEFINE_MUTEX(vnet_list_mutex);
  93
  94 /* func arg to vnet_start_xmit_common() to get the proper tx port */
  95 static struct vnet_port *vsw_tx_port_find(struct sk_buff *skb,
  96                                           struct net_device *dev)
  97 {
  98         struct vnet_port *port = netdev_priv(dev);
  99
 100         return port;
 101 }
 102
 103 static u16 vsw_select_queue(struct net_device *dev, struct sk_buff *skb,
 104                             void *accel_priv, select_queue_fallback_t fallback)
 105 {
 106         struct vnet_port *port = netdev_priv(dev);
 107
 108         if (!port)
 109                 return 0;
 110
 111         return port->q_index;
 112 }
 113
 114 /* Wrappers to common functions */
 115 static int vsw_start_xmit(struct sk_buff *skb, struct net_device *dev)
 116 {
 117         return sunvnet_start_xmit_common(skb, dev, vsw_tx_port_find);
 118 }
 119
 120 static void vsw_set_rx_mode(struct net_device *dev)
 121 {
 122         struct vnet_port *port = netdev_priv(dev);
 123
 124         return sunvnet_set_rx_mode_common(dev, port->vp);
 125 }
 126
 127 #ifdef CONFIG_NET_POLL_CONTROLLER
 128 static void vsw_poll_controller(struct net_device *dev)
 129 {
 130         struct vnet_port *port = netdev_priv(dev);
 131
 132         return sunvnet_poll_controller_common(dev, port->vp);
 133 }
 134 #endif
 135
 136 static const struct net_device_ops vsw_ops = {
 137         .ndo_open               = sunvnet_open_common,
 138         .ndo_stop               = sunvnet_close_common,
 139         .ndo_set_rx_mode        = vsw_set_rx_mode,
 140         .ndo_set_mac_address    = sunvnet_set_mac_addr_common,
 141         .ndo_validate_addr      = eth_validate_addr,
 142         .ndo_tx_timeout         = sunvnet_tx_timeout_common,
 143         .ndo_change_mtu         = sunvnet_change_mtu_common,
 144         .ndo_start_xmit         = vsw_start_xmit,
 145         .ndo_select_queue       = vsw_select_queue,
 146 #ifdef CONFIG_NET_POLL_CONTROLLER
 147         .ndo_poll_controller    = vsw_poll_controller,
 148 #endif
 149 };
 150
 151 static const char *local_mac_prop = "local-mac-address";
 152 static const char *cfg_handle_prop = "cfg-handle";
 153
 154 static struct vnet *vsw_get_vnet(struct mdesc_handle *hp,
 155                                  u64 port_node,
 156                                  u64 *handle)
 157 {
 158         struct vnet *vp;
 159         struct vnet *iter;
 160         const u64 *local_mac = NULL;
 161         const u64 *cfghandle = NULL;
 162         u64 a;
 163
 164         /* Get the parent virtual-network-switch macaddr and cfghandle */
 165         mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
 166                 u64 target = mdesc_arc_target(hp, a);
 167                 const char *name;
 168
 169                 name = mdesc_get_property(hp, target, "name", NULL);
 170                 if (!name || strcmp(name, "virtual-network-switch"))
 171                         continue;
 172
 173                 local_mac = mdesc_get_property(hp, target,
 174                                                local_mac_prop, NULL);
 175                 cfghandle = mdesc_get_property(hp, target,
 176                                                cfg_handle_prop, NULL);
 177                 break;
 178         }
 179         if (!local_mac || !cfghandle)
 180                 return ERR_PTR(-ENODEV);
 181
 182         /* find or create associated vnet */
 183         vp = NULL;
 184         mutex_lock(&vnet_list_mutex);
 185         list_for_each_entry(iter, &vnet_list, list) {
 186                 if (iter->local_mac == *local_mac) {
 187                         vp = iter;
 188                         break;
 189                 }
 190         }
 191
 192         if (!vp) {
 193                 vp = kzalloc(sizeof(*vp), GFP_KERNEL);
 194                 if (unlikely(!vp)) {
 195                         mutex_unlock(&vnet_list_mutex);
 196                         return ERR_PTR(-ENOMEM);
 197                 }
 198
 199                 spin_lock_init(&vp->lock);
 200                 INIT_LIST_HEAD(&vp->port_list);
 201                 INIT_LIST_HEAD(&vp->list);
 202                 vp->local_mac = *local_mac;
 203                 list_add(&vp->list, &vnet_list);
 204         }
 205
 206         mutex_unlock(&vnet_list_mutex);
 207
 208         *handle = (u64)*cfghandle;
 209
 210         return vp;
 211 }
 212
 213 static struct net_device *vsw_alloc_netdev(u8 hwaddr[],
 214                                            struct vio_dev *vdev,
 215                                            u64 handle,
 216                                            u64 port_id)
 217 {
 218         struct net_device *dev;
 219         struct vnet_port *port;
 220         int i;
 221
 222         dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1);
 223         if (!dev)
 224                 return ERR_PTR(-ENOMEM);
 225         dev->needed_headroom = VNET_PACKET_SKIP + 8;
 226         dev->needed_tailroom = 8;
 227
 228         for (i = 0; i < ETH_ALEN; i++) {
 229                 dev->dev_addr[i] = hwaddr[i];
 230                 dev->perm_addr[i] = dev->dev_addr[i];
 231         }
 232
 233         sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id);
 234
 235         dev->netdev_ops = &vsw_ops;
 236         dev->ethtool_ops = &vsw_ethtool_ops;
 237         dev->watchdog_timeo = VSW_TX_TIMEOUT;
 238
 239         dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE |
 240                            NETIF_F_HW_CSUM | NETIF_F_SG;
 241         dev->features = dev->hw_features;
 242
 243         SET_NETDEV_DEV(dev, &vdev->dev);
 244
 245         return dev;
 246 }
 247
 248 static struct ldc_channel_config vsw_ldc_cfg = {
 249         .event          = sunvnet_event_common,
 250         .mtu            = 64,
 251         .mode           = LDC_MODE_UNRELIABLE,
 252 };
 253
 254 static struct vio_driver_ops vsw_vio_ops = {
 255         .send_attr              = sunvnet_send_attr_common,
 256         .handle_attr            = sunvnet_handle_attr_common,
 257         .handshake_complete     = sunvnet_handshake_complete_common,
 258 };
 259
 260 static void print_version(void)
 261 {
 262         printk_once(KERN_INFO "%s", version);
 263 }
 264
 265 static const char *remote_macaddr_prop = "remote-mac-address";
 266 static const char *id_prop = "id";
 267
 268 static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 269 {
 270         struct mdesc_handle *hp;
 271         struct vnet_port *port;
 272         unsigned long flags;
 273         struct vnet *vp;
 274         struct net_device *dev;
 275         const u64 *rmac;
 276         int len, i, err;
 277         const u64 *port_id;
 278         u64 handle;
 279
 280         print_version();
 281
 282         hp = mdesc_grab();
 283
 284         rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
 285         err = -ENODEV;
 286         if (!rmac) {
 287                 pr_err("Port lacks %s property\n", remote_macaddr_prop);
 288                 mdesc_release(hp);
 289                 return err;
 290         }
 291
 292         port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL);
 293         err = -ENODEV;
 294         if (!port_id) {
 295                 pr_err("Port lacks %s property\n", id_prop);
 296                 mdesc_release(hp);
 297                 return err;
 298         }
 299
 300         /* Get (or create) the vnet associated with this port */
 301         vp = vsw_get_vnet(hp, vdev->mp, &handle);
 302         if (unlikely(IS_ERR(vp))) {
 303                 err = PTR_ERR(vp);
 304                 pr_err("Failed to get vnet for vsw-port\n");
 305                 mdesc_release(hp);
 306                 return err;
 307         }
 308
 309         mdesc_release(hp);
 310
 311         dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id);
 312         if (IS_ERR(dev)) {
 313                 err = PTR_ERR(dev);
 314                 pr_err("Failed to alloc netdev for vsw-port\n");
 315                 return err;
 316         }
 317
 318         port = netdev_priv(dev);
 319
 320         INIT_LIST_HEAD(&port->list);
 321
 322         for (i = 0; i < ETH_ALEN; i++)
 323                 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
 324
 325         port->vp = vp;
 326         port->dev = dev;
 327         port->switch_port = 1;
 328         port->tso = true;
 329         port->tsolen = 0;
 330
 331         /* Mark the port as belonging to ldmvsw which directs the
 332          * the common code to use the net_device in the vnet_port
 333          * rather than the net_device in the vnet (which is used
 334          * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE
 335          * macro.
 336          */
 337         port->vsw = 1;
 338
 339         err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
 340                               vsw_versions, ARRAY_SIZE(vsw_versions),
 341                               &vsw_vio_ops, dev->name);
 342         if (err)
 343                 goto err_out_free_dev;
 344
 345         err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port);
 346         if (err)
 347                 goto err_out_free_dev;
 348
 349         dev_set_drvdata(&vdev->dev, port);
 350
 351         netif_napi_add(dev, &port->napi, sunvnet_poll_common,
 352                        NAPI_POLL_WEIGHT);
 353
 354         spin_lock_irqsave(&vp->lock, flags);
 355         list_add_rcu(&port->list, &vp->port_list);
 356         spin_unlock_irqrestore(&vp->lock, flags);
 357
 358         setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common,
 359                     (unsigned long)port);
 360
 361         err = register_netdev(dev);
 362         if (err) {
 363                 pr_err("Cannot register net device, aborting\n");
 364                 goto err_out_del_timer;
 365         }
 366
 367         spin_lock_irqsave(&vp->lock, flags);
 368         sunvnet_port_add_txq_common(port);
 369         spin_unlock_irqrestore(&vp->lock, flags);
 370
 371         napi_enable(&port->napi);
 372         vio_port_up(&port->vio);
 373
 374         netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr);
 375
 376         pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name,
 377                 port->raddr, " switch-port");
 378
 379         return 0;
 380
 381 err_out_del_timer:
 382         del_timer_sync(&port->clean_timer);
 383         list_del_rcu(&port->list);
 384         synchronize_rcu();
 385         netif_napi_del(&port->napi);
 386         dev_set_drvdata(&vdev->dev, NULL);
 387         vio_ldc_free(&port->vio);
 388
 389 err_out_free_dev:
 390         free_netdev(dev);
 391         return err;
 392 }
 393
 394 static int vsw_port_remove(struct vio_dev *vdev)
 395 {
 396         struct vnet_port *port = dev_get_drvdata(&vdev->dev);
 397         unsigned long flags;
 398
 399         if (port) {
 400                 del_timer_sync(&port->vio.timer);
 401
 402                 napi_disable(&port->napi);
 403
 404                 list_del_rcu(&port->list);
 405
 406                 synchronize_rcu();
 407                 del_timer_sync(&port->clean_timer);
 408                 spin_lock_irqsave(&port->vp->lock, flags);
 409                 sunvnet_port_rm_txq_common(port);
 410                 spin_unlock_irqrestore(&port->vp->lock, flags);
 411                 netif_napi_del(&port->napi);
 412                 sunvnet_port_free_tx_bufs_common(port);
 413                 vio_ldc_free(&port->vio);
 414
 415                 dev_set_drvdata(&vdev->dev, NULL);
 416
 417                 unregister_netdev(port->dev);
 418                 free_netdev(port->dev);
 419         }
 420
 421         return 0;
 422 }
 423
 424 static void vsw_cleanup(void)
 425 {
 426         struct vnet *vp;
 427
 428         /* just need to free up the vnet list */
 429         mutex_lock(&vnet_list_mutex);
 430         while (!list_empty(&vnet_list)) {
 431                 vp = list_first_entry(&vnet_list, struct vnet, list);
 432                 list_del(&vp->list);
 433                 /* vio_unregister_driver() should have cleaned up port_list */
 434                 if (!list_empty(&vp->port_list))
 435                         pr_err("Ports not removed by VIO subsystem!\n");
 436                 kfree(vp);
 437         }
 438         mutex_unlock(&vnet_list_mutex);
 439 }
 440
 441 static const struct vio_device_id vsw_port_match[] = {
 442         {
 443                 .type = "vsw-port",
 444         },
 445         {},
 446 };
 447 MODULE_DEVICE_TABLE(vio, vsw_port_match);
 448
 449 static struct vio_driver vsw_port_driver = {
 450         .id_table       = vsw_port_match,
 451         .probe          = vsw_port_probe,
 452         .remove         = vsw_port_remove,
 453         .name           = "vsw_port",
 454 };
 455
 456 static int __init vsw_init(void)
 457 {
 458         return vio_register_driver(&vsw_port_driver);
 459 }
 460
 461 static void __exit vsw_exit(void)
 462 {
 463         vio_unregister_driver(&vsw_port_driver);
 464         vsw_cleanup();
 465 }
 466
 467 module_init(vsw_init);
 468 module_exit(vsw_exit);