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/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/mutex.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/slab.h>
  19 #include <linux/types.h>
  20
  21 #if defined(CONFIG_IPV6)
  22 #include <linux/icmpv6.h>
  23 #endif
  24
  25 #include <net/ip.h>
  26 #include <net/icmp.h>
  27 #include <net/route.h>
  28
  29 #include <asm/vio.h>
  30 #include <asm/ldc.h>
  31
  32 /* This driver makes use of the common code in sunvnet_common.c */
  33 #include "sunvnet_common.h"
  34
  35 /* Length of time before we decide the hardware is hung,
  36  * and dev->tx_timeout() should be called to fix the problem.
  37  */
  38 #define VSW_TX_TIMEOUT                  (10 * HZ)
  39
  40 /* Static HW Addr used for the network interfaces representing vsw ports */
  41 static u8 vsw_port_hwaddr[ETH_ALEN] = {0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
  42
  43 #define DRV_MODULE_NAME         "ldmvsw"
  44 #define DRV_MODULE_VERSION      "1.1"
  45 #define DRV_MODULE_RELDATE      "February 3, 2017"
  46
  47 static char version[] =
  48         DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")";
  49 MODULE_AUTHOR("Oracle");
  50 MODULE_DESCRIPTION("Sun4v LDOM Virtual Switch Driver");
  51 MODULE_LICENSE("GPL");
  52 MODULE_VERSION(DRV_MODULE_VERSION);
  53
  54 /* Ordered from largest major to lowest */
  55 static struct vio_version vsw_versions[] = {
  56         { .major = 1, .minor = 8 },
  57         { .major = 1, .minor = 7 },
  58         { .major = 1, .minor = 6 },
  59         { .major = 1, .minor = 0 },
  60 };
  61
  62 static void vsw_get_drvinfo(struct net_device *dev,
  63                             struct ethtool_drvinfo *info)
  64 {
  65         strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
  66         strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
  67 }
  68
  69 static u32 vsw_get_msglevel(struct net_device *dev)
  70 {
  71         struct vnet_port *port = netdev_priv(dev);
  72
  73         return port->vp->msg_enable;
  74 }
  75
  76 static void vsw_set_msglevel(struct net_device *dev, u32 value)
  77 {
  78         struct vnet_port *port = netdev_priv(dev);
  79
  80         port->vp->msg_enable = value;
  81 }
  82
  83 static const struct ethtool_ops vsw_ethtool_ops = {
  84         .get_drvinfo            = vsw_get_drvinfo,
  85         .get_msglevel           = vsw_get_msglevel,
  86         .set_msglevel           = vsw_set_msglevel,
  87         .get_link               = ethtool_op_get_link,
  88 };
  89
  90 static LIST_HEAD(vnet_list);
  91 static DEFINE_MUTEX(vnet_list_mutex);
  92
  93 /* func arg to vnet_start_xmit_common() to get the proper tx port */
  94 static struct vnet_port *vsw_tx_port_find(struct sk_buff *skb,
  95                                           struct net_device *dev)
  96 {
  97         struct vnet_port *port = netdev_priv(dev);
  98
  99         return port;
 100 }
 101
 102 static u16 vsw_select_queue(struct net_device *dev, struct sk_buff *skb,
 103                             void *accel_priv, select_queue_fallback_t fallback)
 104 {
 105         struct vnet_port *port = netdev_priv(dev);
 106
 107         if (!port)
 108                 return 0;
 109
 110         return port->q_index;
 111 }
 112
 113 /* Wrappers to common functions */
 114 static int vsw_start_xmit(struct sk_buff *skb, struct net_device *dev)
 115 {
 116         return sunvnet_start_xmit_common(skb, dev, vsw_tx_port_find);
 117 }
 118
 119 static void vsw_set_rx_mode(struct net_device *dev)
 120 {
 121         struct vnet_port *port = netdev_priv(dev);
 122
 123         return sunvnet_set_rx_mode_common(dev, port->vp);
 124 }
 125
 126 #ifdef CONFIG_NET_POLL_CONTROLLER
 127 static void vsw_poll_controller(struct net_device *dev)
 128 {
 129         struct vnet_port *port = netdev_priv(dev);
 130
 131         return sunvnet_poll_controller_common(dev, port->vp);
 132 }
 133 #endif
 134
 135 static const struct net_device_ops vsw_ops = {
 136         .ndo_open               = sunvnet_open_common,
 137         .ndo_stop               = sunvnet_close_common,
 138         .ndo_set_rx_mode        = vsw_set_rx_mode,
 139         .ndo_set_mac_address    = sunvnet_set_mac_addr_common,
 140         .ndo_validate_addr      = eth_validate_addr,
 141         .ndo_tx_timeout         = sunvnet_tx_timeout_common,
 142         .ndo_start_xmit         = vsw_start_xmit,
 143         .ndo_select_queue       = vsw_select_queue,
 144 #ifdef CONFIG_NET_POLL_CONTROLLER
 145         .ndo_poll_controller    = vsw_poll_controller,
 146 #endif
 147 };
 148
 149 static const char *local_mac_prop = "local-mac-address";
 150 static const char *cfg_handle_prop = "cfg-handle";
 151
 152 static struct vnet *vsw_get_vnet(struct mdesc_handle *hp,
 153                                  u64 port_node,
 154                                  u64 *handle)
 155 {
 156         struct vnet *vp;
 157         struct vnet *iter;
 158         const u64 *local_mac = NULL;
 159         const u64 *cfghandle = NULL;
 160         u64 a;
 161
 162         /* Get the parent virtual-network-switch macaddr and cfghandle */
 163         mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
 164                 u64 target = mdesc_arc_target(hp, a);
 165                 const char *name;
 166
 167                 name = mdesc_get_property(hp, target, "name", NULL);
 168                 if (!name || strcmp(name, "virtual-network-switch"))
 169                         continue;
 170
 171                 local_mac = mdesc_get_property(hp, target,
 172                                                local_mac_prop, NULL);
 173                 cfghandle = mdesc_get_property(hp, target,
 174                                                cfg_handle_prop, NULL);
 175                 break;
 176         }
 177         if (!local_mac || !cfghandle)
 178                 return ERR_PTR(-ENODEV);
 179
 180         /* find or create associated vnet */
 181         vp = NULL;
 182         mutex_lock(&vnet_list_mutex);
 183         list_for_each_entry(iter, &vnet_list, list) {
 184                 if (iter->local_mac == *local_mac) {
 185                         vp = iter;
 186                         break;
 187                 }
 188         }
 189
 190         if (!vp) {
 191                 vp = kzalloc(sizeof(*vp), GFP_KERNEL);
 192                 if (unlikely(!vp)) {
 193                         mutex_unlock(&vnet_list_mutex);
 194                         return ERR_PTR(-ENOMEM);
 195                 }
 196
 197                 spin_lock_init(&vp->lock);
 198                 INIT_LIST_HEAD(&vp->port_list);
 199                 INIT_LIST_HEAD(&vp->list);
 200                 vp->local_mac = *local_mac;
 201                 list_add(&vp->list, &vnet_list);
 202         }
 203
 204         mutex_unlock(&vnet_list_mutex);
 205
 206         *handle = (u64)*cfghandle;
 207
 208         return vp;
 209 }
 210
 211 static struct net_device *vsw_alloc_netdev(u8 hwaddr[],
 212                                            struct vio_dev *vdev,
 213                                            u64 handle,
 214                                            u64 port_id)
 215 {
 216         struct net_device *dev;
 217         struct vnet_port *port;
 218         int i;
 219
 220         dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1);
 221         if (!dev)
 222                 return ERR_PTR(-ENOMEM);
 223         dev->needed_headroom = VNET_PACKET_SKIP + 8;
 224         dev->needed_tailroom = 8;
 225
 226         for (i = 0; i < ETH_ALEN; i++) {
 227                 dev->dev_addr[i] = hwaddr[i];
 228                 dev->perm_addr[i] = dev->dev_addr[i];
 229         }
 230
 231         sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id);
 232
 233         dev->netdev_ops = &vsw_ops;
 234         dev->ethtool_ops = &vsw_ethtool_ops;
 235         dev->watchdog_timeo = VSW_TX_TIMEOUT;
 236
 237         dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE |
 238                            NETIF_F_HW_CSUM | NETIF_F_SG;
 239         dev->features = dev->hw_features;
 240
 241         /* MTU range: 68 - 65535 */
 242         dev->min_mtu = ETH_MIN_MTU;
 243         dev->max_mtu = VNET_MAX_MTU;
 244
 245         SET_NETDEV_DEV(dev, &vdev->dev);
 246
 247         return dev;
 248 }
 249
 250 static struct ldc_channel_config vsw_ldc_cfg = {
 251         .event          = sunvnet_event_common,
 252         .mtu            = 64,
 253         .mode           = LDC_MODE_UNRELIABLE,
 254 };
 255
 256 static struct vio_driver_ops vsw_vio_ops = {
 257         .send_attr              = sunvnet_send_attr_common,
 258         .handle_attr            = sunvnet_handle_attr_common,
 259         .handshake_complete     = sunvnet_handshake_complete_common,
 260 };
 261
 262 static const char *remote_macaddr_prop = "remote-mac-address";
 263 static const char *id_prop = "id";
 264
 265 static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 266 {
 267         struct mdesc_handle *hp;
 268         struct vnet_port *port;
 269         unsigned long flags;
 270         struct vnet *vp;
 271         struct net_device *dev;
 272         const u64 *rmac;
 273         int len, i, err;
 274         const u64 *port_id;
 275         u64 handle;
 276
 277         hp = mdesc_grab();
 278
 279         rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
 280         err = -ENODEV;
 281         if (!rmac) {
 282                 pr_err("Port lacks %s property\n", remote_macaddr_prop);
 283                 mdesc_release(hp);
 284                 return err;
 285         }
 286
 287         port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL);
 288         err = -ENODEV;
 289         if (!port_id) {
 290                 pr_err("Port lacks %s property\n", id_prop);
 291                 mdesc_release(hp);
 292                 return err;
 293         }
 294
 295         /* Get (or create) the vnet associated with this port */
 296         vp = vsw_get_vnet(hp, vdev->mp, &handle);
 297         if (unlikely(IS_ERR(vp))) {
 298                 err = PTR_ERR(vp);
 299                 pr_err("Failed to get vnet for vsw-port\n");
 300                 mdesc_release(hp);
 301                 return err;
 302         }
 303
 304         mdesc_release(hp);
 305
 306         dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id);
 307         if (IS_ERR(dev)) {
 308                 err = PTR_ERR(dev);
 309                 pr_err("Failed to alloc netdev for vsw-port\n");
 310                 return err;
 311         }
 312
 313         port = netdev_priv(dev);
 314
 315         INIT_LIST_HEAD(&port->list);
 316
 317         for (i = 0; i < ETH_ALEN; i++)
 318                 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
 319
 320         port->vp = vp;
 321         port->dev = dev;
 322         port->switch_port = 1;
 323         port->tso = true;
 324         port->tsolen = 0;
 325
 326         /* Mark the port as belonging to ldmvsw which directs the
 327          * the common code to use the net_device in the vnet_port
 328          * rather than the net_device in the vnet (which is used
 329          * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE
 330          * macro.
 331          */
 332         port->vsw = 1;
 333
 334         err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
 335                               vsw_versions, ARRAY_SIZE(vsw_versions),
 336                               &vsw_vio_ops, dev->name);
 337         if (err)
 338                 goto err_out_free_dev;
 339
 340         err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port);
 341         if (err)
 342                 goto err_out_free_dev;
 343
 344         dev_set_drvdata(&vdev->dev, port);
 345
 346         netif_napi_add(dev, &port->napi, sunvnet_poll_common,
 347                        NAPI_POLL_WEIGHT);
 348
 349         spin_lock_irqsave(&vp->lock, flags);
 350         list_add_rcu(&port->list, &vp->port_list);
 351         spin_unlock_irqrestore(&vp->lock, flags);
 352
 353         setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common,
 354                     (unsigned long)port);
 355
 356         err = register_netdev(dev);
 357         if (err) {
 358                 pr_err("Cannot register net device, aborting\n");
 359                 goto err_out_del_timer;
 360         }
 361
 362         spin_lock_irqsave(&vp->lock, flags);
 363         sunvnet_port_add_txq_common(port);
 364         spin_unlock_irqrestore(&vp->lock, flags);
 365
 366         napi_enable(&port->napi);
 367         vio_port_up(&port->vio);
 368
 369         netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr);
 370
 371         pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name,
 372                 port->raddr, " switch-port");
 373
 374         return 0;
 375
 376 err_out_del_timer:
 377         del_timer_sync(&port->clean_timer);
 378         list_del_rcu(&port->list);
 379         synchronize_rcu();
 380         netif_napi_del(&port->napi);
 381         dev_set_drvdata(&vdev->dev, NULL);
 382         vio_ldc_free(&port->vio);
 383
 384 err_out_free_dev:
 385         free_netdev(dev);
 386         return err;
 387 }
 388
 389 static int vsw_port_remove(struct vio_dev *vdev)
 390 {
 391         struct vnet_port *port = dev_get_drvdata(&vdev->dev);
 392         unsigned long flags;
 393
 394         if (port) {
 395                 del_timer_sync(&port->vio.timer);
 396
 397                 napi_disable(&port->napi);
 398
 399                 list_del_rcu(&port->list);
 400
 401                 synchronize_rcu();
 402                 del_timer_sync(&port->clean_timer);
 403                 spin_lock_irqsave(&port->vp->lock, flags);
 404                 sunvnet_port_rm_txq_common(port);
 405                 spin_unlock_irqrestore(&port->vp->lock, flags);
 406                 netif_napi_del(&port->napi);
 407                 sunvnet_port_free_tx_bufs_common(port);
 408                 vio_ldc_free(&port->vio);
 409
 410                 dev_set_drvdata(&vdev->dev, NULL);
 411
 412                 unregister_netdev(port->dev);
 413                 free_netdev(port->dev);
 414         }
 415
 416         return 0;
 417 }
 418
 419 static void vsw_cleanup(void)
 420 {
 421         struct vnet *vp;
 422
 423         /* just need to free up the vnet list */
 424         mutex_lock(&vnet_list_mutex);
 425         while (!list_empty(&vnet_list)) {
 426                 vp = list_first_entry(&vnet_list, struct vnet, list);
 427                 list_del(&vp->list);
 428                 /* vio_unregister_driver() should have cleaned up port_list */
 429                 if (!list_empty(&vp->port_list))
 430                         pr_err("Ports not removed by VIO subsystem!\n");
 431                 kfree(vp);
 432         }
 433         mutex_unlock(&vnet_list_mutex);
 434 }
 435
 436 static const struct vio_device_id vsw_port_match[] = {
 437         {
 438                 .type = "vsw-port",
 439         },
 440         {},
 441 };
 442 MODULE_DEVICE_TABLE(vio, vsw_port_match);
 443
 444 static struct vio_driver vsw_port_driver = {
 445         .id_table       = vsw_port_match,
 446         .probe          = vsw_port_probe,
 447         .remove         = vsw_port_remove,
 448         .name           = "vsw_port",
 449 };
 450
 451 static int __init vsw_init(void)
 452 {
 453         pr_info("%s\n", version);
 454         return vio_register_driver(&vsw_port_driver);
 455 }
 456
 457 static void __exit vsw_exit(void)
 458 {
 459         vio_unregister_driver(&vsw_port_driver);
 460         vsw_cleanup();
 461 }
 462
 463 module_init(vsw_init);
 464 module_exit(vsw_exit);