drivers/net/ethernet/sun/ldmvsw.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* ldmvsw.c: Sun4v LDOM Virtual Switch Driver.
   3  *
   4  * Copyright (C) 2016-2017 Oracle. All rights reserved.
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/delay.h>
  10 #include <linux/etherdevice.h>
  11 #include <linux/ethtool.h>
  12 #include <linux/highmem.h>
  13 #include <linux/if_vlan.h>
  14 #include <linux/init.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      "1.2"
  46 #define DRV_MODULE_RELDATE      "March 4, 2017"
  47
  48 static char version[] =
  49         DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")";
  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                             struct net_device *sb_dev,
 105                             select_queue_fallback_t fallback)
 106 {
 107         struct vnet_port *port = netdev_priv(dev);
 108
 109         if (!port)
 110                 return 0;
 111
 112         return port->q_index;
 113 }
 114
 115 /* Wrappers to common functions */
 116 static netdev_tx_t vsw_start_xmit(struct sk_buff *skb, struct net_device *dev)
 117 {
 118         return sunvnet_start_xmit_common(skb, dev, vsw_tx_port_find);
 119 }
 120
 121 static void vsw_set_rx_mode(struct net_device *dev)
 122 {
 123         struct vnet_port *port = netdev_priv(dev);
 124
 125         return sunvnet_set_rx_mode_common(dev, port->vp);
 126 }
 127
 128 int ldmvsw_open(struct net_device *dev)
 129 {
 130         struct vnet_port *port = netdev_priv(dev);
 131         struct vio_driver_state *vio = &port->vio;
 132
 133         /* reset the channel */
 134         vio_link_state_change(vio, LDC_EVENT_RESET);
 135         vnet_port_reset(port);
 136         vio_port_up(vio);
 137
 138         return 0;
 139 }
 140 EXPORT_SYMBOL_GPL(ldmvsw_open);
 141
 142 #ifdef CONFIG_NET_POLL_CONTROLLER
 143 static void vsw_poll_controller(struct net_device *dev)
 144 {
 145         struct vnet_port *port = netdev_priv(dev);
 146
 147         return sunvnet_poll_controller_common(dev, port->vp);
 148 }
 149 #endif
 150
 151 static const struct net_device_ops vsw_ops = {
 152         .ndo_open               = ldmvsw_open,
 153         .ndo_stop               = sunvnet_close_common,
 154         .ndo_set_rx_mode        = vsw_set_rx_mode,
 155         .ndo_set_mac_address    = sunvnet_set_mac_addr_common,
 156         .ndo_validate_addr      = eth_validate_addr,
 157         .ndo_tx_timeout         = sunvnet_tx_timeout_common,
 158         .ndo_start_xmit         = vsw_start_xmit,
 159         .ndo_select_queue       = vsw_select_queue,
 160 #ifdef CONFIG_NET_POLL_CONTROLLER
 161         .ndo_poll_controller    = vsw_poll_controller,
 162 #endif
 163 };
 164
 165 static const char *local_mac_prop = "local-mac-address";
 166 static const char *cfg_handle_prop = "cfg-handle";
 167
 168 static struct vnet *vsw_get_vnet(struct mdesc_handle *hp,
 169                                  u64 port_node,
 170                                  u64 *handle)
 171 {
 172         struct vnet *vp;
 173         struct vnet *iter;
 174         const u64 *local_mac = NULL;
 175         const u64 *cfghandle = NULL;
 176         u64 a;
 177
 178         /* Get the parent virtual-network-switch macaddr and cfghandle */
 179         mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
 180                 u64 target = mdesc_arc_target(hp, a);
 181                 const char *name;
 182
 183                 name = mdesc_get_property(hp, target, "name", NULL);
 184                 if (!name || strcmp(name, "virtual-network-switch"))
 185                         continue;
 186
 187                 local_mac = mdesc_get_property(hp, target,
 188                                                local_mac_prop, NULL);
 189                 cfghandle = mdesc_get_property(hp, target,
 190                                                cfg_handle_prop, NULL);
 191                 break;
 192         }
 193         if (!local_mac || !cfghandle)
 194                 return ERR_PTR(-ENODEV);
 195
 196         /* find or create associated vnet */
 197         vp = NULL;
 198         mutex_lock(&vnet_list_mutex);
 199         list_for_each_entry(iter, &vnet_list, list) {
 200                 if (iter->local_mac == *local_mac) {
 201                         vp = iter;
 202                         break;
 203                 }
 204         }
 205
 206         if (!vp) {
 207                 vp = kzalloc(sizeof(*vp), GFP_KERNEL);
 208                 if (unlikely(!vp)) {
 209                         mutex_unlock(&vnet_list_mutex);
 210                         return ERR_PTR(-ENOMEM);
 211                 }
 212
 213                 spin_lock_init(&vp->lock);
 214                 INIT_LIST_HEAD(&vp->port_list);
 215                 INIT_LIST_HEAD(&vp->list);
 216                 vp->local_mac = *local_mac;
 217                 list_add(&vp->list, &vnet_list);
 218         }
 219
 220         mutex_unlock(&vnet_list_mutex);
 221
 222         *handle = (u64)*cfghandle;
 223
 224         return vp;
 225 }
 226
 227 static struct net_device *vsw_alloc_netdev(u8 hwaddr[],
 228                                            struct vio_dev *vdev,
 229                                            u64 handle,
 230                                            u64 port_id)
 231 {
 232         struct net_device *dev;
 233         struct vnet_port *port;
 234         int i;
 235
 236         dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1);
 237         if (!dev)
 238                 return ERR_PTR(-ENOMEM);
 239         dev->needed_headroom = VNET_PACKET_SKIP + 8;
 240         dev->needed_tailroom = 8;
 241
 242         for (i = 0; i < ETH_ALEN; i++) {
 243                 dev->dev_addr[i] = hwaddr[i];
 244                 dev->perm_addr[i] = dev->dev_addr[i];
 245         }
 246
 247         sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id);
 248
 249         dev->netdev_ops = &vsw_ops;
 250         dev->ethtool_ops = &vsw_ethtool_ops;
 251         dev->watchdog_timeo = VSW_TX_TIMEOUT;
 252
 253         dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG;
 254         dev->features = dev->hw_features;
 255
 256         /* MTU range: 68 - 65535 */
 257         dev->min_mtu = ETH_MIN_MTU;
 258         dev->max_mtu = VNET_MAX_MTU;
 259
 260         SET_NETDEV_DEV(dev, &vdev->dev);
 261
 262         return dev;
 263 }
 264
 265 static struct ldc_channel_config vsw_ldc_cfg = {
 266         .event          = sunvnet_event_common,
 267         .mtu            = 64,
 268         .mode           = LDC_MODE_UNRELIABLE,
 269 };
 270
 271 static struct vio_driver_ops vsw_vio_ops = {
 272         .send_attr              = sunvnet_send_attr_common,
 273         .handle_attr            = sunvnet_handle_attr_common,
 274         .handshake_complete     = sunvnet_handshake_complete_common,
 275 };
 276
 277 static const char *remote_macaddr_prop = "remote-mac-address";
 278 static const char *id_prop = "id";
 279
 280 static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 281 {
 282         struct mdesc_handle *hp;
 283         struct vnet_port *port;
 284         unsigned long flags;
 285         struct vnet *vp;
 286         struct net_device *dev;
 287         const u64 *rmac;
 288         int len, i, err;
 289         const u64 *port_id;
 290         u64 handle;
 291
 292         hp = mdesc_grab();
 293
 294         rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
 295         err = -ENODEV;
 296         if (!rmac) {
 297                 pr_err("Port lacks %s property\n", remote_macaddr_prop);
 298                 mdesc_release(hp);
 299                 return err;
 300         }
 301
 302         port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL);
 303         err = -ENODEV;
 304         if (!port_id) {
 305                 pr_err("Port lacks %s property\n", id_prop);
 306                 mdesc_release(hp);
 307                 return err;
 308         }
 309
 310         /* Get (or create) the vnet associated with this port */
 311         vp = vsw_get_vnet(hp, vdev->mp, &handle);
 312         if (IS_ERR(vp)) {
 313                 err = PTR_ERR(vp);
 314                 pr_err("Failed to get vnet for vsw-port\n");
 315                 mdesc_release(hp);
 316                 return err;
 317         }
 318
 319         mdesc_release(hp);
 320
 321         dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id);
 322         if (IS_ERR(dev)) {
 323                 err = PTR_ERR(dev);
 324                 pr_err("Failed to alloc netdev for vsw-port\n");
 325                 return err;
 326         }
 327
 328         port = netdev_priv(dev);
 329
 330         INIT_LIST_HEAD(&port->list);
 331
 332         for (i = 0; i < ETH_ALEN; i++)
 333                 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
 334
 335         port->vp = vp;
 336         port->dev = dev;
 337         port->switch_port = 1;
 338         port->tso = false; /* no tso in vsw, misbehaves in bridge */
 339         port->tsolen = 0;
 340
 341         /* Mark the port as belonging to ldmvsw which directs the
 342          * the common code to use the net_device in the vnet_port
 343          * rather than the net_device in the vnet (which is used
 344          * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE
 345          * macro.
 346          */
 347         port->vsw = 1;
 348
 349         err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
 350                               vsw_versions, ARRAY_SIZE(vsw_versions),
 351                               &vsw_vio_ops, dev->name);
 352         if (err)
 353                 goto err_out_free_dev;
 354
 355         err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port);
 356         if (err)
 357                 goto err_out_free_dev;
 358
 359         dev_set_drvdata(&vdev->dev, port);
 360
 361         netif_napi_add(dev, &port->napi, sunvnet_poll_common,
 362                        NAPI_POLL_WEIGHT);
 363
 364         spin_lock_irqsave(&vp->lock, flags);
 365         list_add_rcu(&port->list, &vp->port_list);
 366         spin_unlock_irqrestore(&vp->lock, flags);
 367
 368         timer_setup(&port->clean_timer, sunvnet_clean_timer_expire_common, 0);
 369
 370         err = register_netdev(dev);
 371         if (err) {
 372                 pr_err("Cannot register net device, aborting\n");
 373                 goto err_out_del_timer;
 374         }
 375
 376         spin_lock_irqsave(&vp->lock, flags);
 377         sunvnet_port_add_txq_common(port);
 378         spin_unlock_irqrestore(&vp->lock, flags);
 379
 380         napi_enable(&port->napi);
 381         vio_port_up(&port->vio);
 382
 383         /* assure no carrier until we receive an LDC_EVENT_UP,
 384          * even if the vsw config script tries to force us up
 385          */
 386         netif_carrier_off(dev);
 387
 388         netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr);
 389
 390         pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name,
 391                 port->raddr, " switch-port");
 392
 393         return 0;
 394
 395 err_out_del_timer:
 396         del_timer_sync(&port->clean_timer);
 397         list_del_rcu(&port->list);
 398         synchronize_rcu();
 399         netif_napi_del(&port->napi);
 400         dev_set_drvdata(&vdev->dev, NULL);
 401         vio_ldc_free(&port->vio);
 402
 403 err_out_free_dev:
 404         free_netdev(dev);
 405         return err;
 406 }
 407
 408 static int vsw_port_remove(struct vio_dev *vdev)
 409 {
 410         struct vnet_port *port = dev_get_drvdata(&vdev->dev);
 411         unsigned long flags;
 412
 413         if (port) {
 414                 del_timer_sync(&port->vio.timer);
 415                 del_timer_sync(&port->clean_timer);
 416
 417                 napi_disable(&port->napi);
 418                 unregister_netdev(port->dev);
 419
 420                 list_del_rcu(&port->list);
 421
 422                 synchronize_rcu();
 423                 spin_lock_irqsave(&port->vp->lock, flags);
 424                 sunvnet_port_rm_txq_common(port);
 425                 spin_unlock_irqrestore(&port->vp->lock, flags);
 426                 netif_napi_del(&port->napi);
 427                 sunvnet_port_free_tx_bufs_common(port);
 428                 vio_ldc_free(&port->vio);
 429
 430                 dev_set_drvdata(&vdev->dev, NULL);
 431
 432                 free_netdev(port->dev);
 433         }
 434
 435         return 0;
 436 }
 437
 438 static void vsw_cleanup(void)
 439 {
 440         struct vnet *vp;
 441
 442         /* just need to free up the vnet list */
 443         mutex_lock(&vnet_list_mutex);
 444         while (!list_empty(&vnet_list)) {
 445                 vp = list_first_entry(&vnet_list, struct vnet, list);
 446                 list_del(&vp->list);
 447                 /* vio_unregister_driver() should have cleaned up port_list */
 448                 if (!list_empty(&vp->port_list))
 449                         pr_err("Ports not removed by VIO subsystem!\n");
 450                 kfree(vp);
 451         }
 452         mutex_unlock(&vnet_list_mutex);
 453 }
 454
 455 static const struct vio_device_id vsw_port_match[] = {
 456         {
 457                 .type = "vsw-port",
 458         },
 459         {},
 460 };
 461 MODULE_DEVICE_TABLE(vio, vsw_port_match);
 462
 463 static struct vio_driver vsw_port_driver = {
 464         .id_table       = vsw_port_match,
 465         .probe          = vsw_port_probe,
 466         .remove         = vsw_port_remove,
 467         .name           = "vsw_port",
 468 };
 469
 470 static int __init vsw_init(void)
 471 {
 472         pr_info("%s\n", version);
 473         return vio_register_driver(&vsw_port_driver);
 474 }
 475
 476 static void __exit vsw_exit(void)
 477 {
 478         vio_unregister_driver(&vsw_port_driver);
 479         vsw_cleanup();
 480 }
 481
 482 module_init(vsw_init);
 483 module_exit(vsw_exit);