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); 469