1 /* ldmvsw.c: Sun4v LDOM Virtual Switch Driver. 2 * 3 * Copyright (C) 2016-2017 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 "1.2" 45 #define DRV_MODULE_RELDATE "March 4, 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 int ldmvsw_open(struct net_device *dev) 127 { 128 struct vnet_port *port = netdev_priv(dev); 129 struct vio_driver_state *vio = &port->vio; 130 131 /* reset the channel */ 132 vio_link_state_change(vio, LDC_EVENT_RESET); 133 vnet_port_reset(port); 134 vio_port_up(vio); 135 136 return 0; 137 } 138 EXPORT_SYMBOL_GPL(ldmvsw_open); 139 140 #ifdef CONFIG_NET_POLL_CONTROLLER 141 static void vsw_poll_controller(struct net_device *dev) 142 { 143 struct vnet_port *port = netdev_priv(dev); 144 145 return sunvnet_poll_controller_common(dev, port->vp); 146 } 147 #endif 148 149 static const struct net_device_ops vsw_ops = { 150 .ndo_open = ldmvsw_open, 151 .ndo_stop = sunvnet_close_common, 152 .ndo_set_rx_mode = vsw_set_rx_mode, 153 .ndo_set_mac_address = sunvnet_set_mac_addr_common, 154 .ndo_validate_addr = eth_validate_addr, 155 .ndo_tx_timeout = sunvnet_tx_timeout_common, 156 .ndo_start_xmit = vsw_start_xmit, 157 .ndo_select_queue = vsw_select_queue, 158 #ifdef CONFIG_NET_POLL_CONTROLLER 159 .ndo_poll_controller = vsw_poll_controller, 160 #endif 161 }; 162 163 static const char *local_mac_prop = "local-mac-address"; 164 static const char *cfg_handle_prop = "cfg-handle"; 165 166 static struct vnet *vsw_get_vnet(struct mdesc_handle *hp, 167 u64 port_node, 168 u64 *handle) 169 { 170 struct vnet *vp; 171 struct vnet *iter; 172 const u64 *local_mac = NULL; 173 const u64 *cfghandle = NULL; 174 u64 a; 175 176 /* Get the parent virtual-network-switch macaddr and cfghandle */ 177 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) { 178 u64 target = mdesc_arc_target(hp, a); 179 const char *name; 180 181 name = mdesc_get_property(hp, target, "name", NULL); 182 if (!name || strcmp(name, "virtual-network-switch")) 183 continue; 184 185 local_mac = mdesc_get_property(hp, target, 186 local_mac_prop, NULL); 187 cfghandle = mdesc_get_property(hp, target, 188 cfg_handle_prop, NULL); 189 break; 190 } 191 if (!local_mac || !cfghandle) 192 return ERR_PTR(-ENODEV); 193 194 /* find or create associated vnet */ 195 vp = NULL; 196 mutex_lock(&vnet_list_mutex); 197 list_for_each_entry(iter, &vnet_list, list) { 198 if (iter->local_mac == *local_mac) { 199 vp = iter; 200 break; 201 } 202 } 203 204 if (!vp) { 205 vp = kzalloc(sizeof(*vp), GFP_KERNEL); 206 if (unlikely(!vp)) { 207 mutex_unlock(&vnet_list_mutex); 208 return ERR_PTR(-ENOMEM); 209 } 210 211 spin_lock_init(&vp->lock); 212 INIT_LIST_HEAD(&vp->port_list); 213 INIT_LIST_HEAD(&vp->list); 214 vp->local_mac = *local_mac; 215 list_add(&vp->list, &vnet_list); 216 } 217 218 mutex_unlock(&vnet_list_mutex); 219 220 *handle = (u64)*cfghandle; 221 222 return vp; 223 } 224 225 static struct net_device *vsw_alloc_netdev(u8 hwaddr[], 226 struct vio_dev *vdev, 227 u64 handle, 228 u64 port_id) 229 { 230 struct net_device *dev; 231 struct vnet_port *port; 232 int i; 233 234 dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1); 235 if (!dev) 236 return ERR_PTR(-ENOMEM); 237 dev->needed_headroom = VNET_PACKET_SKIP + 8; 238 dev->needed_tailroom = 8; 239 240 for (i = 0; i < ETH_ALEN; i++) { 241 dev->dev_addr[i] = hwaddr[i]; 242 dev->perm_addr[i] = dev->dev_addr[i]; 243 } 244 245 sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id); 246 247 dev->netdev_ops = &vsw_ops; 248 dev->ethtool_ops = &vsw_ethtool_ops; 249 dev->watchdog_timeo = VSW_TX_TIMEOUT; 250 251 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG; 252 dev->features = dev->hw_features; 253 254 /* MTU range: 68 - 65535 */ 255 dev->min_mtu = ETH_MIN_MTU; 256 dev->max_mtu = VNET_MAX_MTU; 257 258 SET_NETDEV_DEV(dev, &vdev->dev); 259 260 return dev; 261 } 262 263 static struct ldc_channel_config vsw_ldc_cfg = { 264 .event = sunvnet_event_common, 265 .mtu = 64, 266 .mode = LDC_MODE_UNRELIABLE, 267 }; 268 269 static struct vio_driver_ops vsw_vio_ops = { 270 .send_attr = sunvnet_send_attr_common, 271 .handle_attr = sunvnet_handle_attr_common, 272 .handshake_complete = sunvnet_handshake_complete_common, 273 }; 274 275 static const char *remote_macaddr_prop = "remote-mac-address"; 276 static const char *id_prop = "id"; 277 278 static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) 279 { 280 struct mdesc_handle *hp; 281 struct vnet_port *port; 282 unsigned long flags; 283 struct vnet *vp; 284 struct net_device *dev; 285 const u64 *rmac; 286 int len, i, err; 287 const u64 *port_id; 288 u64 handle; 289 290 hp = mdesc_grab(); 291 292 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); 293 err = -ENODEV; 294 if (!rmac) { 295 pr_err("Port lacks %s property\n", remote_macaddr_prop); 296 mdesc_release(hp); 297 return err; 298 } 299 300 port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL); 301 err = -ENODEV; 302 if (!port_id) { 303 pr_err("Port lacks %s property\n", id_prop); 304 mdesc_release(hp); 305 return err; 306 } 307 308 /* Get (or create) the vnet associated with this port */ 309 vp = vsw_get_vnet(hp, vdev->mp, &handle); 310 if (unlikely(IS_ERR(vp))) { 311 err = PTR_ERR(vp); 312 pr_err("Failed to get vnet for vsw-port\n"); 313 mdesc_release(hp); 314 return err; 315 } 316 317 mdesc_release(hp); 318 319 dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id); 320 if (IS_ERR(dev)) { 321 err = PTR_ERR(dev); 322 pr_err("Failed to alloc netdev for vsw-port\n"); 323 return err; 324 } 325 326 port = netdev_priv(dev); 327 328 INIT_LIST_HEAD(&port->list); 329 330 for (i = 0; i < ETH_ALEN; i++) 331 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; 332 333 port->vp = vp; 334 port->dev = dev; 335 port->switch_port = 1; 336 port->tso = false; /* no tso in vsw, misbehaves in bridge */ 337 port->tsolen = 0; 338 339 /* Mark the port as belonging to ldmvsw which directs the 340 * the common code to use the net_device in the vnet_port 341 * rather than the net_device in the vnet (which is used 342 * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE 343 * macro. 344 */ 345 port->vsw = 1; 346 347 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, 348 vsw_versions, ARRAY_SIZE(vsw_versions), 349 &vsw_vio_ops, dev->name); 350 if (err) 351 goto err_out_free_dev; 352 353 err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port); 354 if (err) 355 goto err_out_free_dev; 356 357 dev_set_drvdata(&vdev->dev, port); 358 359 netif_napi_add(dev, &port->napi, sunvnet_poll_common, 360 NAPI_POLL_WEIGHT); 361 362 spin_lock_irqsave(&vp->lock, flags); 363 list_add_rcu(&port->list, &vp->port_list); 364 spin_unlock_irqrestore(&vp->lock, flags); 365 366 setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common, 367 (unsigned long)port); 368 369 err = register_netdev(dev); 370 if (err) { 371 pr_err("Cannot register net device, aborting\n"); 372 goto err_out_del_timer; 373 } 374 375 spin_lock_irqsave(&vp->lock, flags); 376 sunvnet_port_add_txq_common(port); 377 spin_unlock_irqrestore(&vp->lock, flags); 378 379 napi_enable(&port->napi); 380 vio_port_up(&port->vio); 381 382 /* assure no carrier until we receive an LDC_EVENT_UP, 383 * even if the vsw config script tries to force us up 384 */ 385 netif_carrier_off(dev); 386 387 netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr); 388 389 pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name, 390 port->raddr, " switch-port"); 391 392 return 0; 393 394 err_out_del_timer: 395 del_timer_sync(&port->clean_timer); 396 list_del_rcu(&port->list); 397 synchronize_rcu(); 398 netif_napi_del(&port->napi); 399 dev_set_drvdata(&vdev->dev, NULL); 400 vio_ldc_free(&port->vio); 401 402 err_out_free_dev: 403 free_netdev(dev); 404 return err; 405 } 406 407 static int vsw_port_remove(struct vio_dev *vdev) 408 { 409 struct vnet_port *port = dev_get_drvdata(&vdev->dev); 410 unsigned long flags; 411 412 if (port) { 413 del_timer_sync(&port->vio.timer); 414 415 napi_disable(&port->napi); 416 417 list_del_rcu(&port->list); 418 419 synchronize_rcu(); 420 del_timer_sync(&port->clean_timer); 421 spin_lock_irqsave(&port->vp->lock, flags); 422 sunvnet_port_rm_txq_common(port); 423 spin_unlock_irqrestore(&port->vp->lock, flags); 424 netif_napi_del(&port->napi); 425 sunvnet_port_free_tx_bufs_common(port); 426 vio_ldc_free(&port->vio); 427 428 dev_set_drvdata(&vdev->dev, NULL); 429 430 unregister_netdev(port->dev); 431 free_netdev(port->dev); 432 } 433 434 return 0; 435 } 436 437 static void vsw_cleanup(void) 438 { 439 struct vnet *vp; 440 441 /* just need to free up the vnet list */ 442 mutex_lock(&vnet_list_mutex); 443 while (!list_empty(&vnet_list)) { 444 vp = list_first_entry(&vnet_list, struct vnet, list); 445 list_del(&vp->list); 446 /* vio_unregister_driver() should have cleaned up port_list */ 447 if (!list_empty(&vp->port_list)) 448 pr_err("Ports not removed by VIO subsystem!\n"); 449 kfree(vp); 450 } 451 mutex_unlock(&vnet_list_mutex); 452 } 453 454 static const struct vio_device_id vsw_port_match[] = { 455 { 456 .type = "vsw-port", 457 }, 458 {}, 459 }; 460 MODULE_DEVICE_TABLE(vio, vsw_port_match); 461 462 static struct vio_driver vsw_port_driver = { 463 .id_table = vsw_port_match, 464 .probe = vsw_port_probe, 465 .remove = vsw_port_remove, 466 .name = "vsw_port", 467 }; 468 469 static int __init vsw_init(void) 470 { 471 pr_info("%s\n", version); 472 return vio_register_driver(&vsw_port_driver); 473 } 474 475 static void __exit vsw_exit(void) 476 { 477 vio_unregister_driver(&vsw_port_driver); 478 vsw_cleanup(); 479 } 480 481 module_init(vsw_init); 482 module_exit(vsw_exit); 483