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_change_mtu = sunvnet_change_mtu_common, 143 .ndo_start_xmit = vsw_start_xmit, 144 .ndo_select_queue = vsw_select_queue, 145 #ifdef CONFIG_NET_POLL_CONTROLLER 146 .ndo_poll_controller = vsw_poll_controller, 147 #endif 148 }; 149 150 static const char *local_mac_prop = "local-mac-address"; 151 static const char *cfg_handle_prop = "cfg-handle"; 152 153 static struct vnet *vsw_get_vnet(struct mdesc_handle *hp, 154 u64 port_node, 155 u64 *handle) 156 { 157 struct vnet *vp; 158 struct vnet *iter; 159 const u64 *local_mac = NULL; 160 const u64 *cfghandle = NULL; 161 u64 a; 162 163 /* Get the parent virtual-network-switch macaddr and cfghandle */ 164 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) { 165 u64 target = mdesc_arc_target(hp, a); 166 const char *name; 167 168 name = mdesc_get_property(hp, target, "name", NULL); 169 if (!name || strcmp(name, "virtual-network-switch")) 170 continue; 171 172 local_mac = mdesc_get_property(hp, target, 173 local_mac_prop, NULL); 174 cfghandle = mdesc_get_property(hp, target, 175 cfg_handle_prop, NULL); 176 break; 177 } 178 if (!local_mac || !cfghandle) 179 return ERR_PTR(-ENODEV); 180 181 /* find or create associated vnet */ 182 vp = NULL; 183 mutex_lock(&vnet_list_mutex); 184 list_for_each_entry(iter, &vnet_list, list) { 185 if (iter->local_mac == *local_mac) { 186 vp = iter; 187 break; 188 } 189 } 190 191 if (!vp) { 192 vp = kzalloc(sizeof(*vp), GFP_KERNEL); 193 if (unlikely(!vp)) { 194 mutex_unlock(&vnet_list_mutex); 195 return ERR_PTR(-ENOMEM); 196 } 197 198 spin_lock_init(&vp->lock); 199 INIT_LIST_HEAD(&vp->port_list); 200 INIT_LIST_HEAD(&vp->list); 201 vp->local_mac = *local_mac; 202 list_add(&vp->list, &vnet_list); 203 } 204 205 mutex_unlock(&vnet_list_mutex); 206 207 *handle = (u64)*cfghandle; 208 209 return vp; 210 } 211 212 static struct net_device *vsw_alloc_netdev(u8 hwaddr[], 213 struct vio_dev *vdev, 214 u64 handle, 215 u64 port_id) 216 { 217 struct net_device *dev; 218 struct vnet_port *port; 219 int i; 220 221 dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1); 222 if (!dev) 223 return ERR_PTR(-ENOMEM); 224 dev->needed_headroom = VNET_PACKET_SKIP + 8; 225 dev->needed_tailroom = 8; 226 227 for (i = 0; i < ETH_ALEN; i++) { 228 dev->dev_addr[i] = hwaddr[i]; 229 dev->perm_addr[i] = dev->dev_addr[i]; 230 } 231 232 sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id); 233 234 dev->netdev_ops = &vsw_ops; 235 dev->ethtool_ops = &vsw_ethtool_ops; 236 dev->watchdog_timeo = VSW_TX_TIMEOUT; 237 238 dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE | 239 NETIF_F_HW_CSUM | NETIF_F_SG; 240 dev->features = dev->hw_features; 241 242 SET_NETDEV_DEV(dev, &vdev->dev); 243 244 return dev; 245 } 246 247 static struct ldc_channel_config vsw_ldc_cfg = { 248 .event = sunvnet_event_common, 249 .mtu = 64, 250 .mode = LDC_MODE_UNRELIABLE, 251 }; 252 253 static struct vio_driver_ops vsw_vio_ops = { 254 .send_attr = sunvnet_send_attr_common, 255 .handle_attr = sunvnet_handle_attr_common, 256 .handshake_complete = sunvnet_handshake_complete_common, 257 }; 258 259 static void print_version(void) 260 { 261 printk_once(KERN_INFO "%s", version); 262 } 263 264 static const char *remote_macaddr_prop = "remote-mac-address"; 265 static const char *id_prop = "id"; 266 267 static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) 268 { 269 struct mdesc_handle *hp; 270 struct vnet_port *port; 271 unsigned long flags; 272 struct vnet *vp; 273 struct net_device *dev; 274 const u64 *rmac; 275 int len, i, err; 276 const u64 *port_id; 277 u64 handle; 278 279 print_version(); 280 281 hp = mdesc_grab(); 282 283 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); 284 err = -ENODEV; 285 if (!rmac) { 286 pr_err("Port lacks %s property\n", remote_macaddr_prop); 287 mdesc_release(hp); 288 return err; 289 } 290 291 port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL); 292 err = -ENODEV; 293 if (!port_id) { 294 pr_err("Port lacks %s property\n", id_prop); 295 mdesc_release(hp); 296 return err; 297 } 298 299 /* Get (or create) the vnet associated with this port */ 300 vp = vsw_get_vnet(hp, vdev->mp, &handle); 301 if (unlikely(IS_ERR(vp))) { 302 err = PTR_ERR(vp); 303 pr_err("Failed to get vnet for vsw-port\n"); 304 mdesc_release(hp); 305 return err; 306 } 307 308 mdesc_release(hp); 309 310 dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id); 311 if (IS_ERR(dev)) { 312 err = PTR_ERR(dev); 313 pr_err("Failed to alloc netdev for vsw-port\n"); 314 return err; 315 } 316 317 port = netdev_priv(dev); 318 319 INIT_LIST_HEAD(&port->list); 320 321 for (i = 0; i < ETH_ALEN; i++) 322 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; 323 324 port->vp = vp; 325 port->dev = dev; 326 port->switch_port = 1; 327 port->tso = true; 328 port->tsolen = 0; 329 330 /* Mark the port as belonging to ldmvsw which directs the 331 * the common code to use the net_device in the vnet_port 332 * rather than the net_device in the vnet (which is used 333 * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE 334 * macro. 335 */ 336 port->vsw = 1; 337 338 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, 339 vsw_versions, ARRAY_SIZE(vsw_versions), 340 &vsw_vio_ops, dev->name); 341 if (err) 342 goto err_out_free_dev; 343 344 err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port); 345 if (err) 346 goto err_out_free_dev; 347 348 dev_set_drvdata(&vdev->dev, port); 349 350 netif_napi_add(dev, &port->napi, sunvnet_poll_common, 351 NAPI_POLL_WEIGHT); 352 353 spin_lock_irqsave(&vp->lock, flags); 354 list_add_rcu(&port->list, &vp->port_list); 355 spin_unlock_irqrestore(&vp->lock, flags); 356 357 setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common, 358 (unsigned long)port); 359 360 err = register_netdev(dev); 361 if (err) { 362 pr_err("Cannot register net device, aborting\n"); 363 goto err_out_del_timer; 364 } 365 366 spin_lock_irqsave(&vp->lock, flags); 367 sunvnet_port_add_txq_common(port); 368 spin_unlock_irqrestore(&vp->lock, flags); 369 370 napi_enable(&port->napi); 371 vio_port_up(&port->vio); 372 373 netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr); 374 375 pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name, 376 port->raddr, " switch-port"); 377 378 return 0; 379 380 err_out_del_timer: 381 del_timer_sync(&port->clean_timer); 382 list_del_rcu(&port->list); 383 synchronize_rcu(); 384 netif_napi_del(&port->napi); 385 dev_set_drvdata(&vdev->dev, NULL); 386 vio_ldc_free(&port->vio); 387 388 err_out_free_dev: 389 free_netdev(dev); 390 return err; 391 } 392 393 static int vsw_port_remove(struct vio_dev *vdev) 394 { 395 struct vnet_port *port = dev_get_drvdata(&vdev->dev); 396 unsigned long flags; 397 398 if (port) { 399 del_timer_sync(&port->vio.timer); 400 401 napi_disable(&port->napi); 402 403 list_del_rcu(&port->list); 404 405 synchronize_rcu(); 406 del_timer_sync(&port->clean_timer); 407 spin_lock_irqsave(&port->vp->lock, flags); 408 sunvnet_port_rm_txq_common(port); 409 spin_unlock_irqrestore(&port->vp->lock, flags); 410 netif_napi_del(&port->napi); 411 sunvnet_port_free_tx_bufs_common(port); 412 vio_ldc_free(&port->vio); 413 414 dev_set_drvdata(&vdev->dev, NULL); 415 416 unregister_netdev(port->dev); 417 free_netdev(port->dev); 418 } 419 420 return 0; 421 } 422 423 static void vsw_cleanup(void) 424 { 425 struct vnet *vp; 426 427 /* just need to free up the vnet list */ 428 mutex_lock(&vnet_list_mutex); 429 while (!list_empty(&vnet_list)) { 430 vp = list_first_entry(&vnet_list, struct vnet, list); 431 list_del(&vp->list); 432 /* vio_unregister_driver() should have cleaned up port_list */ 433 if (!list_empty(&vp->port_list)) 434 pr_err("Ports not removed by VIO subsystem!\n"); 435 kfree(vp); 436 } 437 mutex_unlock(&vnet_list_mutex); 438 } 439 440 static const struct vio_device_id vsw_port_match[] = { 441 { 442 .type = "vsw-port", 443 }, 444 {}, 445 }; 446 MODULE_DEVICE_TABLE(vio, vsw_port_match); 447 448 static struct vio_driver vsw_port_driver = { 449 .id_table = vsw_port_match, 450 .probe = vsw_port_probe, 451 .remove = vsw_port_remove, 452 .name = "vsw_port", 453 }; 454 455 static int __init vsw_init(void) 456 { 457 return vio_register_driver(&vsw_port_driver); 458 } 459 460 static void __exit vsw_exit(void) 461 { 462 vio_unregister_driver(&vsw_port_driver); 463 vsw_cleanup(); 464 } 465 466 module_init(vsw_init); 467 module_exit(vsw_exit); 468