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 "1.0" 45 #define DRV_MODULE_RELDATE "Jan 15, 2016" 46 47 static char version[] = 48 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; 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 void print_version(void) 263 { 264 printk_once(KERN_INFO "%s", version); 265 } 266 267 static const char *remote_macaddr_prop = "remote-mac-address"; 268 static const char *id_prop = "id"; 269 270 static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) 271 { 272 struct mdesc_handle *hp; 273 struct vnet_port *port; 274 unsigned long flags; 275 struct vnet *vp; 276 struct net_device *dev; 277 const u64 *rmac; 278 int len, i, err; 279 const u64 *port_id; 280 u64 handle; 281 282 print_version(); 283 284 hp = mdesc_grab(); 285 286 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); 287 err = -ENODEV; 288 if (!rmac) { 289 pr_err("Port lacks %s property\n", remote_macaddr_prop); 290 mdesc_release(hp); 291 return err; 292 } 293 294 port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL); 295 err = -ENODEV; 296 if (!port_id) { 297 pr_err("Port lacks %s property\n", id_prop); 298 mdesc_release(hp); 299 return err; 300 } 301 302 /* Get (or create) the vnet associated with this port */ 303 vp = vsw_get_vnet(hp, vdev->mp, &handle); 304 if (unlikely(IS_ERR(vp))) { 305 err = PTR_ERR(vp); 306 pr_err("Failed to get vnet for vsw-port\n"); 307 mdesc_release(hp); 308 return err; 309 } 310 311 mdesc_release(hp); 312 313 dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id); 314 if (IS_ERR(dev)) { 315 err = PTR_ERR(dev); 316 pr_err("Failed to alloc netdev for vsw-port\n"); 317 return err; 318 } 319 320 port = netdev_priv(dev); 321 322 INIT_LIST_HEAD(&port->list); 323 324 for (i = 0; i < ETH_ALEN; i++) 325 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; 326 327 port->vp = vp; 328 port->dev = dev; 329 port->switch_port = 1; 330 port->tso = true; 331 port->tsolen = 0; 332 333 /* Mark the port as belonging to ldmvsw which directs the 334 * the common code to use the net_device in the vnet_port 335 * rather than the net_device in the vnet (which is used 336 * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE 337 * macro. 338 */ 339 port->vsw = 1; 340 341 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, 342 vsw_versions, ARRAY_SIZE(vsw_versions), 343 &vsw_vio_ops, dev->name); 344 if (err) 345 goto err_out_free_dev; 346 347 err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port); 348 if (err) 349 goto err_out_free_dev; 350 351 dev_set_drvdata(&vdev->dev, port); 352 353 netif_napi_add(dev, &port->napi, sunvnet_poll_common, 354 NAPI_POLL_WEIGHT); 355 356 spin_lock_irqsave(&vp->lock, flags); 357 list_add_rcu(&port->list, &vp->port_list); 358 spin_unlock_irqrestore(&vp->lock, flags); 359 360 setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common, 361 (unsigned long)port); 362 363 err = register_netdev(dev); 364 if (err) { 365 pr_err("Cannot register net device, aborting\n"); 366 goto err_out_del_timer; 367 } 368 369 spin_lock_irqsave(&vp->lock, flags); 370 sunvnet_port_add_txq_common(port); 371 spin_unlock_irqrestore(&vp->lock, flags); 372 373 napi_enable(&port->napi); 374 vio_port_up(&port->vio); 375 376 netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr); 377 378 pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name, 379 port->raddr, " switch-port"); 380 381 return 0; 382 383 err_out_del_timer: 384 del_timer_sync(&port->clean_timer); 385 list_del_rcu(&port->list); 386 synchronize_rcu(); 387 netif_napi_del(&port->napi); 388 dev_set_drvdata(&vdev->dev, NULL); 389 vio_ldc_free(&port->vio); 390 391 err_out_free_dev: 392 free_netdev(dev); 393 return err; 394 } 395 396 static int vsw_port_remove(struct vio_dev *vdev) 397 { 398 struct vnet_port *port = dev_get_drvdata(&vdev->dev); 399 unsigned long flags; 400 401 if (port) { 402 del_timer_sync(&port->vio.timer); 403 404 napi_disable(&port->napi); 405 406 list_del_rcu(&port->list); 407 408 synchronize_rcu(); 409 del_timer_sync(&port->clean_timer); 410 spin_lock_irqsave(&port->vp->lock, flags); 411 sunvnet_port_rm_txq_common(port); 412 spin_unlock_irqrestore(&port->vp->lock, flags); 413 netif_napi_del(&port->napi); 414 sunvnet_port_free_tx_bufs_common(port); 415 vio_ldc_free(&port->vio); 416 417 dev_set_drvdata(&vdev->dev, NULL); 418 419 unregister_netdev(port->dev); 420 free_netdev(port->dev); 421 } 422 423 return 0; 424 } 425 426 static void vsw_cleanup(void) 427 { 428 struct vnet *vp; 429 430 /* just need to free up the vnet list */ 431 mutex_lock(&vnet_list_mutex); 432 while (!list_empty(&vnet_list)) { 433 vp = list_first_entry(&vnet_list, struct vnet, list); 434 list_del(&vp->list); 435 /* vio_unregister_driver() should have cleaned up port_list */ 436 if (!list_empty(&vp->port_list)) 437 pr_err("Ports not removed by VIO subsystem!\n"); 438 kfree(vp); 439 } 440 mutex_unlock(&vnet_list_mutex); 441 } 442 443 static const struct vio_device_id vsw_port_match[] = { 444 { 445 .type = "vsw-port", 446 }, 447 {}, 448 }; 449 MODULE_DEVICE_TABLE(vio, vsw_port_match); 450 451 static struct vio_driver vsw_port_driver = { 452 .id_table = vsw_port_match, 453 .probe = vsw_port_probe, 454 .remove = vsw_port_remove, 455 .name = "vsw_port", 456 }; 457 458 static int __init vsw_init(void) 459 { 460 return vio_register_driver(&vsw_port_driver); 461 } 462 463 static void __exit vsw_exit(void) 464 { 465 vio_unregister_driver(&vsw_port_driver); 466 vsw_cleanup(); 467 } 468 469 module_init(vsw_init); 470 module_exit(vsw_exit); 471