1 // SPDX-License-Identifier: GPL-2.0 2 /* ldmvsw.c: Sun4v LDOM Virtual Switch Driver. 3 * 4 * Copyright (C) 2016-2017 Oracle. All rights reserved. 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/delay.h> 10 #include <linux/etherdevice.h> 11 #include <linux/ethtool.h> 12 #include <linux/highmem.h> 13 #include <linux/if_vlan.h> 14 #include <linux/init.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 "1.2" 46 #define DRV_MODULE_RELDATE "March 4, 2017" 47 48 static char version[] = 49 DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")"; 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 struct net_device *sb_dev) 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 netdev_tx_t 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 int ldmvsw_open(struct net_device *dev) 128 { 129 struct vnet_port *port = netdev_priv(dev); 130 struct vio_driver_state *vio = &port->vio; 131 132 /* reset the channel */ 133 vio_link_state_change(vio, LDC_EVENT_RESET); 134 vnet_port_reset(port); 135 vio_port_up(vio); 136 137 return 0; 138 } 139 EXPORT_SYMBOL_GPL(ldmvsw_open); 140 141 #ifdef CONFIG_NET_POLL_CONTROLLER 142 static void vsw_poll_controller(struct net_device *dev) 143 { 144 struct vnet_port *port = netdev_priv(dev); 145 146 return sunvnet_poll_controller_common(dev, port->vp); 147 } 148 #endif 149 150 static const struct net_device_ops vsw_ops = { 151 .ndo_open = ldmvsw_open, 152 .ndo_stop = sunvnet_close_common, 153 .ndo_set_rx_mode = vsw_set_rx_mode, 154 .ndo_set_mac_address = sunvnet_set_mac_addr_common, 155 .ndo_validate_addr = eth_validate_addr, 156 .ndo_tx_timeout = sunvnet_tx_timeout_common, 157 .ndo_start_xmit = vsw_start_xmit, 158 .ndo_select_queue = vsw_select_queue, 159 #ifdef CONFIG_NET_POLL_CONTROLLER 160 .ndo_poll_controller = vsw_poll_controller, 161 #endif 162 }; 163 164 static const char *local_mac_prop = "local-mac-address"; 165 static const char *cfg_handle_prop = "cfg-handle"; 166 167 static struct vnet *vsw_get_vnet(struct mdesc_handle *hp, 168 u64 port_node, 169 u64 *handle) 170 { 171 struct vnet *vp; 172 struct vnet *iter; 173 const u64 *local_mac = NULL; 174 const u64 *cfghandle = NULL; 175 u64 a; 176 177 /* Get the parent virtual-network-switch macaddr and cfghandle */ 178 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) { 179 u64 target = mdesc_arc_target(hp, a); 180 const char *name; 181 182 name = mdesc_get_property(hp, target, "name", NULL); 183 if (!name || strcmp(name, "virtual-network-switch")) 184 continue; 185 186 local_mac = mdesc_get_property(hp, target, 187 local_mac_prop, NULL); 188 cfghandle = mdesc_get_property(hp, target, 189 cfg_handle_prop, NULL); 190 break; 191 } 192 if (!local_mac || !cfghandle) 193 return ERR_PTR(-ENODEV); 194 195 /* find or create associated vnet */ 196 vp = NULL; 197 mutex_lock(&vnet_list_mutex); 198 list_for_each_entry(iter, &vnet_list, list) { 199 if (iter->local_mac == *local_mac) { 200 vp = iter; 201 break; 202 } 203 } 204 205 if (!vp) { 206 vp = kzalloc(sizeof(*vp), GFP_KERNEL); 207 if (unlikely(!vp)) { 208 mutex_unlock(&vnet_list_mutex); 209 return ERR_PTR(-ENOMEM); 210 } 211 212 spin_lock_init(&vp->lock); 213 INIT_LIST_HEAD(&vp->port_list); 214 INIT_LIST_HEAD(&vp->list); 215 vp->local_mac = *local_mac; 216 list_add(&vp->list, &vnet_list); 217 } 218 219 mutex_unlock(&vnet_list_mutex); 220 221 *handle = (u64)*cfghandle; 222 223 return vp; 224 } 225 226 static struct net_device *vsw_alloc_netdev(u8 hwaddr[], 227 struct vio_dev *vdev, 228 u64 handle, 229 u64 port_id) 230 { 231 struct net_device *dev; 232 struct vnet_port *port; 233 int i; 234 235 dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1); 236 if (!dev) 237 return ERR_PTR(-ENOMEM); 238 dev->needed_headroom = VNET_PACKET_SKIP + 8; 239 dev->needed_tailroom = 8; 240 241 for (i = 0; i < ETH_ALEN; i++) { 242 dev->dev_addr[i] = hwaddr[i]; 243 dev->perm_addr[i] = dev->dev_addr[i]; 244 } 245 246 sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id); 247 248 dev->netdev_ops = &vsw_ops; 249 dev->ethtool_ops = &vsw_ethtool_ops; 250 dev->watchdog_timeo = VSW_TX_TIMEOUT; 251 252 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG; 253 dev->features = dev->hw_features; 254 255 /* MTU range: 68 - 65535 */ 256 dev->min_mtu = ETH_MIN_MTU; 257 dev->max_mtu = VNET_MAX_MTU; 258 259 SET_NETDEV_DEV(dev, &vdev->dev); 260 261 return dev; 262 } 263 264 static struct ldc_channel_config vsw_ldc_cfg = { 265 .event = sunvnet_event_common, 266 .mtu = 64, 267 .mode = LDC_MODE_UNRELIABLE, 268 }; 269 270 static struct vio_driver_ops vsw_vio_ops = { 271 .send_attr = sunvnet_send_attr_common, 272 .handle_attr = sunvnet_handle_attr_common, 273 .handshake_complete = sunvnet_handshake_complete_common, 274 }; 275 276 static const char *remote_macaddr_prop = "remote-mac-address"; 277 static const char *id_prop = "id"; 278 279 static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) 280 { 281 struct mdesc_handle *hp; 282 struct vnet_port *port; 283 unsigned long flags; 284 struct vnet *vp; 285 struct net_device *dev; 286 const u64 *rmac; 287 int len, i, err; 288 const u64 *port_id; 289 u64 handle; 290 291 hp = mdesc_grab(); 292 293 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); 294 err = -ENODEV; 295 if (!rmac) { 296 pr_err("Port lacks %s property\n", remote_macaddr_prop); 297 mdesc_release(hp); 298 return err; 299 } 300 301 port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL); 302 err = -ENODEV; 303 if (!port_id) { 304 pr_err("Port lacks %s property\n", id_prop); 305 mdesc_release(hp); 306 return err; 307 } 308 309 /* Get (or create) the vnet associated with this port */ 310 vp = vsw_get_vnet(hp, vdev->mp, &handle); 311 if (IS_ERR(vp)) { 312 err = PTR_ERR(vp); 313 pr_err("Failed to get vnet for vsw-port\n"); 314 mdesc_release(hp); 315 return err; 316 } 317 318 mdesc_release(hp); 319 320 dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id); 321 if (IS_ERR(dev)) { 322 err = PTR_ERR(dev); 323 pr_err("Failed to alloc netdev for vsw-port\n"); 324 return err; 325 } 326 327 port = netdev_priv(dev); 328 329 INIT_LIST_HEAD(&port->list); 330 331 for (i = 0; i < ETH_ALEN; i++) 332 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; 333 334 port->vp = vp; 335 port->dev = dev; 336 port->switch_port = 1; 337 port->tso = false; /* no tso in vsw, misbehaves in bridge */ 338 port->tsolen = 0; 339 340 /* Mark the port as belonging to ldmvsw which directs the 341 * the common code to use the net_device in the vnet_port 342 * rather than the net_device in the vnet (which is used 343 * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE 344 * macro. 345 */ 346 port->vsw = 1; 347 348 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, 349 vsw_versions, ARRAY_SIZE(vsw_versions), 350 &vsw_vio_ops, dev->name); 351 if (err) 352 goto err_out_free_dev; 353 354 err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port); 355 if (err) 356 goto err_out_free_dev; 357 358 dev_set_drvdata(&vdev->dev, port); 359 360 netif_napi_add(dev, &port->napi, sunvnet_poll_common, 361 NAPI_POLL_WEIGHT); 362 363 spin_lock_irqsave(&vp->lock, flags); 364 list_add_rcu(&port->list, &vp->port_list); 365 spin_unlock_irqrestore(&vp->lock, flags); 366 367 timer_setup(&port->clean_timer, sunvnet_clean_timer_expire_common, 0); 368 369 err = register_netdev(dev); 370 if (err) { 371 pr_err("Cannot register net device, aborting\n"); 372 goto err_out_del_timer; 373 } 374 375 spin_lock_irqsave(&vp->lock, flags); 376 sunvnet_port_add_txq_common(port); 377 spin_unlock_irqrestore(&vp->lock, flags); 378 379 napi_enable(&port->napi); 380 vio_port_up(&port->vio); 381 382 /* assure no carrier until we receive an LDC_EVENT_UP, 383 * even if the vsw config script tries to force us up 384 */ 385 netif_carrier_off(dev); 386 387 netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr); 388 389 pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name, 390 port->raddr, " switch-port"); 391 392 return 0; 393 394 err_out_del_timer: 395 del_timer_sync(&port->clean_timer); 396 list_del_rcu(&port->list); 397 synchronize_rcu(); 398 netif_napi_del(&port->napi); 399 dev_set_drvdata(&vdev->dev, NULL); 400 vio_ldc_free(&port->vio); 401 402 err_out_free_dev: 403 free_netdev(dev); 404 return err; 405 } 406 407 static int vsw_port_remove(struct vio_dev *vdev) 408 { 409 struct vnet_port *port = dev_get_drvdata(&vdev->dev); 410 unsigned long flags; 411 412 if (port) { 413 del_timer_sync(&port->vio.timer); 414 del_timer_sync(&port->clean_timer); 415 416 napi_disable(&port->napi); 417 unregister_netdev(port->dev); 418 419 list_del_rcu(&port->list); 420 421 synchronize_rcu(); 422 spin_lock_irqsave(&port->vp->lock, flags); 423 sunvnet_port_rm_txq_common(port); 424 spin_unlock_irqrestore(&port->vp->lock, flags); 425 netif_napi_del(&port->napi); 426 sunvnet_port_free_tx_bufs_common(port); 427 vio_ldc_free(&port->vio); 428 429 dev_set_drvdata(&vdev->dev, NULL); 430 431 free_netdev(port->dev); 432 } 433 434 return 0; 435 } 436 437 static void vsw_cleanup(void) 438 { 439 struct vnet *vp; 440 441 /* just need to free up the vnet list */ 442 mutex_lock(&vnet_list_mutex); 443 while (!list_empty(&vnet_list)) { 444 vp = list_first_entry(&vnet_list, struct vnet, list); 445 list_del(&vp->list); 446 /* vio_unregister_driver() should have cleaned up port_list */ 447 if (!list_empty(&vp->port_list)) 448 pr_err("Ports not removed by VIO subsystem!\n"); 449 kfree(vp); 450 } 451 mutex_unlock(&vnet_list_mutex); 452 } 453 454 static const struct vio_device_id vsw_port_match[] = { 455 { 456 .type = "vsw-port", 457 }, 458 {}, 459 }; 460 MODULE_DEVICE_TABLE(vio, vsw_port_match); 461 462 static struct vio_driver vsw_port_driver = { 463 .id_table = vsw_port_match, 464 .probe = vsw_port_probe, 465 .remove = vsw_port_remove, 466 .name = "vsw_port", 467 }; 468 469 static int __init vsw_init(void) 470 { 471 pr_info("%s\n", version); 472 return vio_register_driver(&vsw_port_driver); 473 } 474 475 static void __exit vsw_exit(void) 476 { 477 vio_unregister_driver(&vsw_port_driver); 478 vsw_cleanup(); 479 } 480 481 module_init(vsw_init); 482 module_exit(vsw_exit); 483