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_change_mtu = sunvnet_change_mtu_common, 163 .ndo_start_xmit = vnet_start_xmit, 164 .ndo_select_queue = vnet_select_queue, 165 #ifdef CONFIG_NET_POLL_CONTROLLER 166 .ndo_poll_controller = vnet_poll_controller, 167 #endif 168 }; 169 170 static struct vnet *vnet_new(const u64 *local_mac, 171 struct vio_dev *vdev) 172 { 173 struct net_device *dev; 174 struct vnet *vp; 175 int err, i; 176 177 dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1); 178 if (!dev) 179 return ERR_PTR(-ENOMEM); 180 dev->needed_headroom = VNET_PACKET_SKIP + 8; 181 dev->needed_tailroom = 8; 182 183 for (i = 0; i < ETH_ALEN; i++) 184 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff; 185 186 vp = netdev_priv(dev); 187 188 spin_lock_init(&vp->lock); 189 vp->dev = dev; 190 191 INIT_LIST_HEAD(&vp->port_list); 192 for (i = 0; i < VNET_PORT_HASH_SIZE; i++) 193 INIT_HLIST_HEAD(&vp->port_hash[i]); 194 INIT_LIST_HEAD(&vp->list); 195 vp->local_mac = *local_mac; 196 197 dev->netdev_ops = &vnet_ops; 198 dev->ethtool_ops = &vnet_ethtool_ops; 199 dev->watchdog_timeo = VNET_TX_TIMEOUT; 200 201 dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE | 202 NETIF_F_HW_CSUM | NETIF_F_SG; 203 dev->features = dev->hw_features; 204 205 SET_NETDEV_DEV(dev, &vdev->dev); 206 207 err = register_netdev(dev); 208 if (err) { 209 pr_err("Cannot register net device, aborting\n"); 210 goto err_out_free_dev; 211 } 212 213 netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr); 214 215 list_add(&vp->list, &vnet_list); 216 217 return vp; 218 219 err_out_free_dev: 220 free_netdev(dev); 221 222 return ERR_PTR(err); 223 } 224 225 static struct vnet *vnet_find_or_create(const u64 *local_mac, 226 struct vio_dev *vdev) 227 { 228 struct vnet *iter, *vp; 229 230 mutex_lock(&vnet_list_mutex); 231 vp = NULL; 232 list_for_each_entry(iter, &vnet_list, list) { 233 if (iter->local_mac == *local_mac) { 234 vp = iter; 235 break; 236 } 237 } 238 if (!vp) 239 vp = vnet_new(local_mac, vdev); 240 mutex_unlock(&vnet_list_mutex); 241 242 return vp; 243 } 244 245 static void vnet_cleanup(void) 246 { 247 struct vnet *vp; 248 struct net_device *dev; 249 250 mutex_lock(&vnet_list_mutex); 251 while (!list_empty(&vnet_list)) { 252 vp = list_first_entry(&vnet_list, struct vnet, list); 253 list_del(&vp->list); 254 dev = vp->dev; 255 /* vio_unregister_driver() should have cleaned up port_list */ 256 BUG_ON(!list_empty(&vp->port_list)); 257 unregister_netdev(dev); 258 free_netdev(dev); 259 } 260 mutex_unlock(&vnet_list_mutex); 261 } 262 263 static const char *local_mac_prop = "local-mac-address"; 264 265 static struct vnet *vnet_find_parent(struct mdesc_handle *hp, 266 u64 port_node, 267 struct vio_dev *vdev) 268 { 269 const u64 *local_mac = NULL; 270 u64 a; 271 272 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) { 273 u64 target = mdesc_arc_target(hp, a); 274 const char *name; 275 276 name = mdesc_get_property(hp, target, "name", NULL); 277 if (!name || strcmp(name, "network")) 278 continue; 279 280 local_mac = mdesc_get_property(hp, target, 281 local_mac_prop, NULL); 282 if (local_mac) 283 break; 284 } 285 if (!local_mac) 286 return ERR_PTR(-ENODEV); 287 288 return vnet_find_or_create(local_mac, vdev); 289 } 290 291 static struct ldc_channel_config vnet_ldc_cfg = { 292 .event = sunvnet_event_common, 293 .mtu = 64, 294 .mode = LDC_MODE_UNRELIABLE, 295 }; 296 297 static struct vio_driver_ops vnet_vio_ops = { 298 .send_attr = sunvnet_send_attr_common, 299 .handle_attr = sunvnet_handle_attr_common, 300 .handshake_complete = sunvnet_handshake_complete_common, 301 }; 302 303 static void print_version(void) 304 { 305 printk_once(KERN_INFO "%s", version); 306 } 307 308 const char *remote_macaddr_prop = "remote-mac-address"; 309 310 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) 311 { 312 struct mdesc_handle *hp; 313 struct vnet_port *port; 314 unsigned long flags; 315 struct vnet *vp; 316 const u64 *rmac; 317 int len, i, err, switch_port; 318 319 print_version(); 320 321 hp = mdesc_grab(); 322 323 vp = vnet_find_parent(hp, vdev->mp, vdev); 324 if (IS_ERR(vp)) { 325 pr_err("Cannot find port parent vnet\n"); 326 err = PTR_ERR(vp); 327 goto err_out_put_mdesc; 328 } 329 330 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); 331 err = -ENODEV; 332 if (!rmac) { 333 pr_err("Port lacks %s property\n", remote_macaddr_prop); 334 goto err_out_put_mdesc; 335 } 336 337 port = kzalloc(sizeof(*port), GFP_KERNEL); 338 err = -ENOMEM; 339 if (!port) 340 goto err_out_put_mdesc; 341 342 for (i = 0; i < ETH_ALEN; i++) 343 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; 344 345 port->vp = vp; 346 347 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, 348 vnet_versions, ARRAY_SIZE(vnet_versions), 349 &vnet_vio_ops, vp->dev->name); 350 if (err) 351 goto err_out_free_port; 352 353 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port); 354 if (err) 355 goto err_out_free_port; 356 357 netif_napi_add(port->vp->dev, &port->napi, sunvnet_poll_common, 358 NAPI_POLL_WEIGHT); 359 360 INIT_HLIST_NODE(&port->hash); 361 INIT_LIST_HEAD(&port->list); 362 363 switch_port = 0; 364 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL)) 365 switch_port = 1; 366 port->switch_port = switch_port; 367 port->tso = true; 368 port->tsolen = 0; 369 370 spin_lock_irqsave(&vp->lock, flags); 371 if (switch_port) 372 list_add_rcu(&port->list, &vp->port_list); 373 else 374 list_add_tail_rcu(&port->list, &vp->port_list); 375 hlist_add_head_rcu(&port->hash, 376 &vp->port_hash[vnet_hashfn(port->raddr)]); 377 sunvnet_port_add_txq_common(port); 378 spin_unlock_irqrestore(&vp->lock, flags); 379 380 dev_set_drvdata(&vdev->dev, port); 381 382 pr_info("%s: PORT ( remote-mac %pM%s )\n", 383 vp->dev->name, port->raddr, switch_port ? " switch-port" : ""); 384 385 setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common, 386 (unsigned long)port); 387 388 napi_enable(&port->napi); 389 vio_port_up(&port->vio); 390 391 mdesc_release(hp); 392 393 return 0; 394 395 err_out_free_port: 396 kfree(port); 397 398 err_out_put_mdesc: 399 mdesc_release(hp); 400 return err; 401 } 402 403 static int vnet_port_remove(struct vio_dev *vdev) 404 { 405 struct vnet_port *port = dev_get_drvdata(&vdev->dev); 406 407 if (port) { 408 del_timer_sync(&port->vio.timer); 409 410 napi_disable(&port->napi); 411 412 list_del_rcu(&port->list); 413 hlist_del_rcu(&port->hash); 414 415 synchronize_rcu(); 416 del_timer_sync(&port->clean_timer); 417 sunvnet_port_rm_txq_common(port); 418 netif_napi_del(&port->napi); 419 sunvnet_port_free_tx_bufs_common(port); 420 vio_ldc_free(&port->vio); 421 422 dev_set_drvdata(&vdev->dev, NULL); 423 424 kfree(port); 425 } 426 return 0; 427 } 428 429 static const struct vio_device_id vnet_port_match[] = { 430 { 431 .type = "vnet-port", 432 }, 433 {}, 434 }; 435 MODULE_DEVICE_TABLE(vio, vnet_port_match); 436 437 static struct vio_driver vnet_port_driver = { 438 .id_table = vnet_port_match, 439 .probe = vnet_port_probe, 440 .remove = vnet_port_remove, 441 .name = "vnet_port", 442 }; 443 444 static int __init vnet_init(void) 445 { 446 return vio_register_driver(&vnet_port_driver); 447 } 448 449 static void __exit vnet_exit(void) 450 { 451 vio_unregister_driver(&vnet_port_driver); 452 vnet_cleanup(); 453 } 454 455 module_init(vnet_init); 456 module_exit(vnet_exit); 457