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 "1.1" 45 #define DRV_MODULE_RELDATE "February 3, 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 #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_HW_CSUM | NETIF_F_SG; 238 dev->features = dev->hw_features; 239 240 /* MTU range: 68 - 65535 */ 241 dev->min_mtu = ETH_MIN_MTU; 242 dev->max_mtu = VNET_MAX_MTU; 243 244 SET_NETDEV_DEV(dev, &vdev->dev); 245 246 return dev; 247 } 248 249 static struct ldc_channel_config vsw_ldc_cfg = { 250 .event = sunvnet_event_common, 251 .mtu = 64, 252 .mode = LDC_MODE_UNRELIABLE, 253 }; 254 255 static struct vio_driver_ops vsw_vio_ops = { 256 .send_attr = sunvnet_send_attr_common, 257 .handle_attr = sunvnet_handle_attr_common, 258 .handshake_complete = sunvnet_handshake_complete_common, 259 }; 260 261 static const char *remote_macaddr_prop = "remote-mac-address"; 262 static const char *id_prop = "id"; 263 264 static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) 265 { 266 struct mdesc_handle *hp; 267 struct vnet_port *port; 268 unsigned long flags; 269 struct vnet *vp; 270 struct net_device *dev; 271 const u64 *rmac; 272 int len, i, err; 273 const u64 *port_id; 274 u64 handle; 275 276 hp = mdesc_grab(); 277 278 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); 279 err = -ENODEV; 280 if (!rmac) { 281 pr_err("Port lacks %s property\n", remote_macaddr_prop); 282 mdesc_release(hp); 283 return err; 284 } 285 286 port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL); 287 err = -ENODEV; 288 if (!port_id) { 289 pr_err("Port lacks %s property\n", id_prop); 290 mdesc_release(hp); 291 return err; 292 } 293 294 /* Get (or create) the vnet associated with this port */ 295 vp = vsw_get_vnet(hp, vdev->mp, &handle); 296 if (unlikely(IS_ERR(vp))) { 297 err = PTR_ERR(vp); 298 pr_err("Failed to get vnet for vsw-port\n"); 299 mdesc_release(hp); 300 return err; 301 } 302 303 mdesc_release(hp); 304 305 dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id); 306 if (IS_ERR(dev)) { 307 err = PTR_ERR(dev); 308 pr_err("Failed to alloc netdev for vsw-port\n"); 309 return err; 310 } 311 312 port = netdev_priv(dev); 313 314 INIT_LIST_HEAD(&port->list); 315 316 for (i = 0; i < ETH_ALEN; i++) 317 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; 318 319 port->vp = vp; 320 port->dev = dev; 321 port->switch_port = 1; 322 port->tso = false; /* no tso in vsw, misbehaves in bridge */ 323 port->tsolen = 0; 324 325 /* Mark the port as belonging to ldmvsw which directs the 326 * the common code to use the net_device in the vnet_port 327 * rather than the net_device in the vnet (which is used 328 * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE 329 * macro. 330 */ 331 port->vsw = 1; 332 333 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, 334 vsw_versions, ARRAY_SIZE(vsw_versions), 335 &vsw_vio_ops, dev->name); 336 if (err) 337 goto err_out_free_dev; 338 339 err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port); 340 if (err) 341 goto err_out_free_dev; 342 343 dev_set_drvdata(&vdev->dev, port); 344 345 netif_napi_add(dev, &port->napi, sunvnet_poll_common, 346 NAPI_POLL_WEIGHT); 347 348 spin_lock_irqsave(&vp->lock, flags); 349 list_add_rcu(&port->list, &vp->port_list); 350 spin_unlock_irqrestore(&vp->lock, flags); 351 352 setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common, 353 (unsigned long)port); 354 355 err = register_netdev(dev); 356 if (err) { 357 pr_err("Cannot register net device, aborting\n"); 358 goto err_out_del_timer; 359 } 360 361 spin_lock_irqsave(&vp->lock, flags); 362 sunvnet_port_add_txq_common(port); 363 spin_unlock_irqrestore(&vp->lock, flags); 364 365 napi_enable(&port->napi); 366 vio_port_up(&port->vio); 367 368 netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr); 369 370 pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name, 371 port->raddr, " switch-port"); 372 373 return 0; 374 375 err_out_del_timer: 376 del_timer_sync(&port->clean_timer); 377 list_del_rcu(&port->list); 378 synchronize_rcu(); 379 netif_napi_del(&port->napi); 380 dev_set_drvdata(&vdev->dev, NULL); 381 vio_ldc_free(&port->vio); 382 383 err_out_free_dev: 384 free_netdev(dev); 385 return err; 386 } 387 388 static int vsw_port_remove(struct vio_dev *vdev) 389 { 390 struct vnet_port *port = dev_get_drvdata(&vdev->dev); 391 unsigned long flags; 392 393 if (port) { 394 del_timer_sync(&port->vio.timer); 395 396 napi_disable(&port->napi); 397 398 list_del_rcu(&port->list); 399 400 synchronize_rcu(); 401 del_timer_sync(&port->clean_timer); 402 spin_lock_irqsave(&port->vp->lock, flags); 403 sunvnet_port_rm_txq_common(port); 404 spin_unlock_irqrestore(&port->vp->lock, flags); 405 netif_napi_del(&port->napi); 406 sunvnet_port_free_tx_bufs_common(port); 407 vio_ldc_free(&port->vio); 408 409 dev_set_drvdata(&vdev->dev, NULL); 410 411 unregister_netdev(port->dev); 412 free_netdev(port->dev); 413 } 414 415 return 0; 416 } 417 418 static void vsw_cleanup(void) 419 { 420 struct vnet *vp; 421 422 /* just need to free up the vnet list */ 423 mutex_lock(&vnet_list_mutex); 424 while (!list_empty(&vnet_list)) { 425 vp = list_first_entry(&vnet_list, struct vnet, list); 426 list_del(&vp->list); 427 /* vio_unregister_driver() should have cleaned up port_list */ 428 if (!list_empty(&vp->port_list)) 429 pr_err("Ports not removed by VIO subsystem!\n"); 430 kfree(vp); 431 } 432 mutex_unlock(&vnet_list_mutex); 433 } 434 435 static const struct vio_device_id vsw_port_match[] = { 436 { 437 .type = "vsw-port", 438 }, 439 {}, 440 }; 441 MODULE_DEVICE_TABLE(vio, vsw_port_match); 442 443 static struct vio_driver vsw_port_driver = { 444 .id_table = vsw_port_match, 445 .probe = vsw_port_probe, 446 .remove = vsw_port_remove, 447 .name = "vsw_port", 448 }; 449 450 static int __init vsw_init(void) 451 { 452 pr_info("%s\n", version); 453 return vio_register_driver(&vsw_port_driver); 454 } 455 456 static void __exit vsw_exit(void) 457 { 458 vio_unregister_driver(&vsw_port_driver); 459 vsw_cleanup(); 460 } 461 462 module_init(vsw_init); 463 module_exit(vsw_exit); 464