1 /* sunvnet.c: Sun LDOM Virtual Network Driver. 2 * 3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> 4 * Copyright (C) 2016 Oracle. All rights reserved. 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/module.h> 10 #include <linux/kernel.h> 11 #include <linux/types.h> 12 #include <linux/slab.h> 13 #include <linux/delay.h> 14 #include <linux/init.h> 15 #include <linux/netdevice.h> 16 #include <linux/ethtool.h> 17 #include <linux/etherdevice.h> 18 #include <linux/mutex.h> 19 #include <linux/highmem.h> 20 #include <linux/if_vlan.h> 21 22 #if IS_ENABLED(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 #include "sunvnet_common.h" 34 35 /* length of time before we decide the hardware is borked, 36 * and dev->tx_timeout() should be called to fix the problem 37 */ 38 #define VNET_TX_TIMEOUT (5 * HZ) 39 40 #define DRV_MODULE_NAME "sunvnet" 41 #define DRV_MODULE_VERSION "1.0" 42 #define DRV_MODULE_RELDATE "June 25, 2007" 43 44 static char version[] = 45 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; 46 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); 47 MODULE_DESCRIPTION("Sun LDOM virtual network driver"); 48 MODULE_LICENSE("GPL"); 49 MODULE_VERSION(DRV_MODULE_VERSION); 50 51 /* Ordered from largest major to lowest */ 52 static struct vio_version vnet_versions[] = { 53 { .major = 1, .minor = 8 }, 54 { .major = 1, .minor = 7 }, 55 { .major = 1, .minor = 6 }, 56 { .major = 1, .minor = 0 }, 57 }; 58 59 static void vnet_get_drvinfo(struct net_device *dev, 60 struct ethtool_drvinfo *info) 61 { 62 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver)); 63 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version)); 64 } 65 66 static u32 vnet_get_msglevel(struct net_device *dev) 67 { 68 struct vnet *vp = netdev_priv(dev); 69 70 return vp->msg_enable; 71 } 72 73 static void vnet_set_msglevel(struct net_device *dev, u32 value) 74 { 75 struct vnet *vp = netdev_priv(dev); 76 77 vp->msg_enable = value; 78 } 79 80 static const struct ethtool_ops vnet_ethtool_ops = { 81 .get_drvinfo = vnet_get_drvinfo, 82 .get_msglevel = vnet_get_msglevel, 83 .set_msglevel = vnet_set_msglevel, 84 .get_link = ethtool_op_get_link, 85 }; 86 87 static LIST_HEAD(vnet_list); 88 static DEFINE_MUTEX(vnet_list_mutex); 89 90 static struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb) 91 { 92 unsigned int hash = vnet_hashfn(skb->data); 93 struct hlist_head *hp = &vp->port_hash[hash]; 94 struct vnet_port *port; 95 96 hlist_for_each_entry_rcu(port, hp, hash) { 97 if (!sunvnet_port_is_up_common(port)) 98 continue; 99 if (ether_addr_equal(port->raddr, skb->data)) 100 return port; 101 } 102 list_for_each_entry_rcu(port, &vp->port_list, list) { 103 if (!port->switch_port) 104 continue; 105 if (!sunvnet_port_is_up_common(port)) 106 continue; 107 return port; 108 } 109 return NULL; 110 } 111 112 /* func arg to vnet_start_xmit_common() to get the proper tx port */ 113 static struct vnet_port *vnet_tx_port_find(struct sk_buff *skb, 114 struct net_device *dev) 115 { 116 struct vnet *vp = netdev_priv(dev); 117 118 return __tx_port_find(vp, skb); 119 } 120 121 static u16 vnet_select_queue(struct net_device *dev, struct sk_buff *skb, 122 void *accel_priv, select_queue_fallback_t fallback) 123 { 124 struct vnet *vp = netdev_priv(dev); 125 struct vnet_port *port = __tx_port_find(vp, skb); 126 127 if (!port) 128 return 0; 129 130 return port->q_index; 131 } 132 133 /* Wrappers to common functions */ 134 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) 135 { 136 return sunvnet_start_xmit_common(skb, dev, vnet_tx_port_find); 137 } 138 139 static void vnet_set_rx_mode(struct net_device *dev) 140 { 141 struct vnet *vp = netdev_priv(dev); 142 143 return sunvnet_set_rx_mode_common(dev, vp); 144 } 145 146 #ifdef CONFIG_NET_POLL_CONTROLLER 147 static void vnet_poll_controller(struct net_device *dev) 148 { 149 struct vnet *vp = netdev_priv(dev); 150 151 return sunvnet_poll_controller_common(dev, vp); 152 } 153 #endif 154 155 static const struct net_device_ops vnet_ops = { 156 .ndo_open = sunvnet_open_common, 157 .ndo_stop = sunvnet_close_common, 158 .ndo_set_rx_mode = vnet_set_rx_mode, 159 .ndo_set_mac_address = sunvnet_set_mac_addr_common, 160 .ndo_validate_addr = eth_validate_addr, 161 .ndo_tx_timeout = sunvnet_tx_timeout_common, 162 .ndo_start_xmit = vnet_start_xmit, 163 .ndo_select_queue = vnet_select_queue, 164 #ifdef CONFIG_NET_POLL_CONTROLLER 165 .ndo_poll_controller = vnet_poll_controller, 166 #endif 167 }; 168 169 static struct vnet *vnet_new(const u64 *local_mac, 170 struct vio_dev *vdev) 171 { 172 struct net_device *dev; 173 struct vnet *vp; 174 int err, i; 175 176 dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1); 177 if (!dev) 178 return ERR_PTR(-ENOMEM); 179 dev->needed_headroom = VNET_PACKET_SKIP + 8; 180 dev->needed_tailroom = 8; 181 182 for (i = 0; i < ETH_ALEN; i++) 183 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff; 184 185 vp = netdev_priv(dev); 186 187 spin_lock_init(&vp->lock); 188 vp->dev = dev; 189 190 INIT_LIST_HEAD(&vp->port_list); 191 for (i = 0; i < VNET_PORT_HASH_SIZE; i++) 192 INIT_HLIST_HEAD(&vp->port_hash[i]); 193 INIT_LIST_HEAD(&vp->list); 194 vp->local_mac = *local_mac; 195 196 dev->netdev_ops = &vnet_ops; 197 dev->ethtool_ops = &vnet_ethtool_ops; 198 dev->watchdog_timeo = VNET_TX_TIMEOUT; 199 200 dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE | 201 NETIF_F_HW_CSUM | NETIF_F_SG; 202 dev->features = dev->hw_features; 203 204 /* MTU range: 68 - 65535 */ 205 dev->min_mtu = ETH_MIN_MTU; 206 dev->max_mtu = VNET_MAX_MTU; 207 208 SET_NETDEV_DEV(dev, &vdev->dev); 209 210 err = register_netdev(dev); 211 if (err) { 212 pr_err("Cannot register net device, aborting\n"); 213 goto err_out_free_dev; 214 } 215 216 netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr); 217 218 list_add(&vp->list, &vnet_list); 219 220 return vp; 221 222 err_out_free_dev: 223 free_netdev(dev); 224 225 return ERR_PTR(err); 226 } 227 228 static struct vnet *vnet_find_or_create(const u64 *local_mac, 229 struct vio_dev *vdev) 230 { 231 struct vnet *iter, *vp; 232 233 mutex_lock(&vnet_list_mutex); 234 vp = NULL; 235 list_for_each_entry(iter, &vnet_list, list) { 236 if (iter->local_mac == *local_mac) { 237 vp = iter; 238 break; 239 } 240 } 241 if (!vp) 242 vp = vnet_new(local_mac, vdev); 243 mutex_unlock(&vnet_list_mutex); 244 245 return vp; 246 } 247 248 static void vnet_cleanup(void) 249 { 250 struct vnet *vp; 251 struct net_device *dev; 252 253 mutex_lock(&vnet_list_mutex); 254 while (!list_empty(&vnet_list)) { 255 vp = list_first_entry(&vnet_list, struct vnet, list); 256 list_del(&vp->list); 257 dev = vp->dev; 258 /* vio_unregister_driver() should have cleaned up port_list */ 259 BUG_ON(!list_empty(&vp->port_list)); 260 unregister_netdev(dev); 261 free_netdev(dev); 262 } 263 mutex_unlock(&vnet_list_mutex); 264 } 265 266 static const char *local_mac_prop = "local-mac-address"; 267 268 static struct vnet *vnet_find_parent(struct mdesc_handle *hp, 269 u64 port_node, 270 struct vio_dev *vdev) 271 { 272 const u64 *local_mac = NULL; 273 u64 a; 274 275 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) { 276 u64 target = mdesc_arc_target(hp, a); 277 const char *name; 278 279 name = mdesc_get_property(hp, target, "name", NULL); 280 if (!name || strcmp(name, "network")) 281 continue; 282 283 local_mac = mdesc_get_property(hp, target, 284 local_mac_prop, NULL); 285 if (local_mac) 286 break; 287 } 288 if (!local_mac) 289 return ERR_PTR(-ENODEV); 290 291 return vnet_find_or_create(local_mac, vdev); 292 } 293 294 static struct ldc_channel_config vnet_ldc_cfg = { 295 .event = sunvnet_event_common, 296 .mtu = 64, 297 .mode = LDC_MODE_UNRELIABLE, 298 }; 299 300 static struct vio_driver_ops vnet_vio_ops = { 301 .send_attr = sunvnet_send_attr_common, 302 .handle_attr = sunvnet_handle_attr_common, 303 .handshake_complete = sunvnet_handshake_complete_common, 304 }; 305 306 static void print_version(void) 307 { 308 printk_once(KERN_INFO "%s", version); 309 } 310 311 const char *remote_macaddr_prop = "remote-mac-address"; 312 313 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) 314 { 315 struct mdesc_handle *hp; 316 struct vnet_port *port; 317 unsigned long flags; 318 struct vnet *vp; 319 const u64 *rmac; 320 int len, i, err, switch_port; 321 322 print_version(); 323 324 hp = mdesc_grab(); 325 326 vp = vnet_find_parent(hp, vdev->mp, vdev); 327 if (IS_ERR(vp)) { 328 pr_err("Cannot find port parent vnet\n"); 329 err = PTR_ERR(vp); 330 goto err_out_put_mdesc; 331 } 332 333 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); 334 err = -ENODEV; 335 if (!rmac) { 336 pr_err("Port lacks %s property\n", remote_macaddr_prop); 337 goto err_out_put_mdesc; 338 } 339 340 port = kzalloc(sizeof(*port), GFP_KERNEL); 341 err = -ENOMEM; 342 if (!port) 343 goto err_out_put_mdesc; 344 345 for (i = 0; i < ETH_ALEN; i++) 346 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; 347 348 port->vp = vp; 349 350 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, 351 vnet_versions, ARRAY_SIZE(vnet_versions), 352 &vnet_vio_ops, vp->dev->name); 353 if (err) 354 goto err_out_free_port; 355 356 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port); 357 if (err) 358 goto err_out_free_port; 359 360 netif_napi_add(port->vp->dev, &port->napi, sunvnet_poll_common, 361 NAPI_POLL_WEIGHT); 362 363 INIT_HLIST_NODE(&port->hash); 364 INIT_LIST_HEAD(&port->list); 365 366 switch_port = 0; 367 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL)) 368 switch_port = 1; 369 port->switch_port = switch_port; 370 port->tso = true; 371 port->tsolen = 0; 372 373 spin_lock_irqsave(&vp->lock, flags); 374 if (switch_port) 375 list_add_rcu(&port->list, &vp->port_list); 376 else 377 list_add_tail_rcu(&port->list, &vp->port_list); 378 hlist_add_head_rcu(&port->hash, 379 &vp->port_hash[vnet_hashfn(port->raddr)]); 380 sunvnet_port_add_txq_common(port); 381 spin_unlock_irqrestore(&vp->lock, flags); 382 383 dev_set_drvdata(&vdev->dev, port); 384 385 pr_info("%s: PORT ( remote-mac %pM%s )\n", 386 vp->dev->name, port->raddr, switch_port ? " switch-port" : ""); 387 388 setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common, 389 (unsigned long)port); 390 391 napi_enable(&port->napi); 392 vio_port_up(&port->vio); 393 394 mdesc_release(hp); 395 396 return 0; 397 398 err_out_free_port: 399 kfree(port); 400 401 err_out_put_mdesc: 402 mdesc_release(hp); 403 return err; 404 } 405 406 static int vnet_port_remove(struct vio_dev *vdev) 407 { 408 struct vnet_port *port = dev_get_drvdata(&vdev->dev); 409 410 if (port) { 411 del_timer_sync(&port->vio.timer); 412 413 napi_disable(&port->napi); 414 415 list_del_rcu(&port->list); 416 hlist_del_rcu(&port->hash); 417 418 synchronize_rcu(); 419 del_timer_sync(&port->clean_timer); 420 sunvnet_port_rm_txq_common(port); 421 netif_napi_del(&port->napi); 422 sunvnet_port_free_tx_bufs_common(port); 423 vio_ldc_free(&port->vio); 424 425 dev_set_drvdata(&vdev->dev, NULL); 426 427 kfree(port); 428 } 429 return 0; 430 } 431 432 static const struct vio_device_id vnet_port_match[] = { 433 { 434 .type = "vnet-port", 435 }, 436 {}, 437 }; 438 MODULE_DEVICE_TABLE(vio, vnet_port_match); 439 440 static struct vio_driver vnet_port_driver = { 441 .id_table = vnet_port_match, 442 .probe = vnet_port_probe, 443 .remove = vnet_port_remove, 444 .name = "vnet_port", 445 }; 446 447 static int __init vnet_init(void) 448 { 449 return vio_register_driver(&vnet_port_driver); 450 } 451 452 static void __exit vnet_exit(void) 453 { 454 vio_unregister_driver(&vnet_port_driver); 455 vnet_cleanup(); 456 } 457 458 module_init(vnet_init); 459 module_exit(vnet_exit); 460