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 strscpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver)); 67 strscpy(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 static 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 } 139 140 #ifdef CONFIG_NET_POLL_CONTROLLER 141 static void vsw_poll_controller(struct net_device *dev) 142 { 143 struct vnet_port *port = netdev_priv(dev); 144 145 return sunvnet_poll_controller_common(dev, port->vp); 146 } 147 #endif 148 149 static const struct net_device_ops vsw_ops = { 150 .ndo_open = ldmvsw_open, 151 .ndo_stop = sunvnet_close_common, 152 .ndo_set_rx_mode = vsw_set_rx_mode, 153 .ndo_set_mac_address = sunvnet_set_mac_addr_common, 154 .ndo_validate_addr = eth_validate_addr, 155 .ndo_tx_timeout = sunvnet_tx_timeout_common, 156 .ndo_start_xmit = vsw_start_xmit, 157 .ndo_select_queue = vsw_select_queue, 158 #ifdef CONFIG_NET_POLL_CONTROLLER 159 .ndo_poll_controller = vsw_poll_controller, 160 #endif 161 }; 162 163 static const char *local_mac_prop = "local-mac-address"; 164 static const char *cfg_handle_prop = "cfg-handle"; 165 166 static struct vnet *vsw_get_vnet(struct mdesc_handle *hp, 167 u64 port_node, 168 u64 *handle) 169 { 170 struct vnet *vp; 171 struct vnet *iter; 172 const u64 *local_mac = NULL; 173 const u64 *cfghandle = NULL; 174 u64 a; 175 176 /* Get the parent virtual-network-switch macaddr and cfghandle */ 177 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) { 178 u64 target = mdesc_arc_target(hp, a); 179 const char *name; 180 181 name = mdesc_get_property(hp, target, "name", NULL); 182 if (!name || strcmp(name, "virtual-network-switch")) 183 continue; 184 185 local_mac = mdesc_get_property(hp, target, 186 local_mac_prop, NULL); 187 cfghandle = mdesc_get_property(hp, target, 188 cfg_handle_prop, NULL); 189 break; 190 } 191 if (!local_mac || !cfghandle) 192 return ERR_PTR(-ENODEV); 193 194 /* find or create associated vnet */ 195 vp = NULL; 196 mutex_lock(&vnet_list_mutex); 197 list_for_each_entry(iter, &vnet_list, list) { 198 if (iter->local_mac == *local_mac) { 199 vp = iter; 200 break; 201 } 202 } 203 204 if (!vp) { 205 vp = kzalloc(sizeof(*vp), GFP_KERNEL); 206 if (unlikely(!vp)) { 207 mutex_unlock(&vnet_list_mutex); 208 return ERR_PTR(-ENOMEM); 209 } 210 211 spin_lock_init(&vp->lock); 212 INIT_LIST_HEAD(&vp->port_list); 213 INIT_LIST_HEAD(&vp->list); 214 vp->local_mac = *local_mac; 215 list_add(&vp->list, &vnet_list); 216 } 217 218 mutex_unlock(&vnet_list_mutex); 219 220 *handle = (u64)*cfghandle; 221 222 return vp; 223 } 224 225 static struct net_device *vsw_alloc_netdev(u8 hwaddr[], 226 struct vio_dev *vdev, 227 u64 handle, 228 u64 port_id) 229 { 230 struct net_device *dev; 231 struct vnet_port *port; 232 233 dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1); 234 if (!dev) 235 return ERR_PTR(-ENOMEM); 236 dev->needed_headroom = VNET_PACKET_SKIP + 8; 237 dev->needed_tailroom = 8; 238 239 eth_hw_addr_set(dev, hwaddr); 240 ether_addr_copy(dev->perm_addr, dev->dev_addr); 241 242 sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id); 243 244 dev->netdev_ops = &vsw_ops; 245 dev->ethtool_ops = &vsw_ethtool_ops; 246 dev->watchdog_timeo = VSW_TX_TIMEOUT; 247 248 dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG; 249 dev->features = dev->hw_features; 250 251 /* MTU range: 68 - 65535 */ 252 dev->min_mtu = ETH_MIN_MTU; 253 dev->max_mtu = VNET_MAX_MTU; 254 255 SET_NETDEV_DEV(dev, &vdev->dev); 256 257 return dev; 258 } 259 260 static struct ldc_channel_config vsw_ldc_cfg = { 261 .event = sunvnet_event_common, 262 .mtu = 64, 263 .mode = LDC_MODE_UNRELIABLE, 264 }; 265 266 static struct vio_driver_ops vsw_vio_ops = { 267 .send_attr = sunvnet_send_attr_common, 268 .handle_attr = sunvnet_handle_attr_common, 269 .handshake_complete = sunvnet_handshake_complete_common, 270 }; 271 272 static const char *remote_macaddr_prop = "remote-mac-address"; 273 static const char *id_prop = "id"; 274 275 static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) 276 { 277 struct mdesc_handle *hp; 278 struct vnet_port *port; 279 unsigned long flags; 280 struct vnet *vp; 281 struct net_device *dev; 282 const u64 *rmac; 283 int len, i, err; 284 const u64 *port_id; 285 u64 handle; 286 287 hp = mdesc_grab(); 288 289 if (!hp) 290 return -ENODEV; 291 292 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); 293 err = -ENODEV; 294 if (!rmac) { 295 pr_err("Port lacks %s property\n", remote_macaddr_prop); 296 mdesc_release(hp); 297 return err; 298 } 299 300 port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL); 301 err = -ENODEV; 302 if (!port_id) { 303 pr_err("Port lacks %s property\n", id_prop); 304 mdesc_release(hp); 305 return err; 306 } 307 308 /* Get (or create) the vnet associated with this port */ 309 vp = vsw_get_vnet(hp, vdev->mp, &handle); 310 if (IS_ERR(vp)) { 311 err = PTR_ERR(vp); 312 pr_err("Failed to get vnet for vsw-port\n"); 313 mdesc_release(hp); 314 return err; 315 } 316 317 mdesc_release(hp); 318 319 dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id); 320 if (IS_ERR(dev)) { 321 err = PTR_ERR(dev); 322 pr_err("Failed to alloc netdev for vsw-port\n"); 323 return err; 324 } 325 326 port = netdev_priv(dev); 327 328 INIT_LIST_HEAD(&port->list); 329 330 for (i = 0; i < ETH_ALEN; i++) 331 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; 332 333 port->vp = vp; 334 port->dev = dev; 335 port->switch_port = 1; 336 port->tso = false; /* no tso in vsw, misbehaves in bridge */ 337 port->tsolen = 0; 338 339 /* Mark the port as belonging to ldmvsw which directs the 340 * common code to use the net_device in the vnet_port 341 * rather than the net_device in the vnet (which is used 342 * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE 343 * macro. 344 */ 345 port->vsw = 1; 346 347 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, 348 vsw_versions, ARRAY_SIZE(vsw_versions), 349 &vsw_vio_ops, dev->name); 350 if (err) 351 goto err_out_free_dev; 352 353 err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port); 354 if (err) 355 goto err_out_free_dev; 356 357 dev_set_drvdata(&vdev->dev, port); 358 359 netif_napi_add(dev, &port->napi, sunvnet_poll_common); 360 361 spin_lock_irqsave(&vp->lock, flags); 362 list_add_rcu(&port->list, &vp->port_list); 363 spin_unlock_irqrestore(&vp->lock, flags); 364 365 timer_setup(&port->clean_timer, sunvnet_clean_timer_expire_common, 0); 366 367 err = register_netdev(dev); 368 if (err) { 369 pr_err("Cannot register net device, aborting\n"); 370 goto err_out_del_timer; 371 } 372 373 spin_lock_irqsave(&vp->lock, flags); 374 sunvnet_port_add_txq_common(port); 375 spin_unlock_irqrestore(&vp->lock, flags); 376 377 napi_enable(&port->napi); 378 vio_port_up(&port->vio); 379 380 /* assure no carrier until we receive an LDC_EVENT_UP, 381 * even if the vsw config script tries to force us up 382 */ 383 netif_carrier_off(dev); 384 385 netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr); 386 387 pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name, 388 port->raddr, " switch-port"); 389 390 return 0; 391 392 err_out_del_timer: 393 del_timer_sync(&port->clean_timer); 394 list_del_rcu(&port->list); 395 synchronize_rcu(); 396 netif_napi_del(&port->napi); 397 dev_set_drvdata(&vdev->dev, NULL); 398 vio_ldc_free(&port->vio); 399 400 err_out_free_dev: 401 free_netdev(dev); 402 return err; 403 } 404 405 static void vsw_port_remove(struct vio_dev *vdev) 406 { 407 struct vnet_port *port = dev_get_drvdata(&vdev->dev); 408 unsigned long flags; 409 410 if (port) { 411 del_timer_sync(&port->vio.timer); 412 del_timer_sync(&port->clean_timer); 413 414 napi_disable(&port->napi); 415 unregister_netdev(port->dev); 416 417 list_del_rcu(&port->list); 418 419 synchronize_rcu(); 420 spin_lock_irqsave(&port->vp->lock, flags); 421 sunvnet_port_rm_txq_common(port); 422 spin_unlock_irqrestore(&port->vp->lock, flags); 423 netif_napi_del(&port->napi); 424 sunvnet_port_free_tx_bufs_common(port); 425 vio_ldc_free(&port->vio); 426 427 dev_set_drvdata(&vdev->dev, NULL); 428 429 free_netdev(port->dev); 430 } 431 } 432 433 static void vsw_cleanup(void) 434 { 435 struct vnet *vp; 436 437 /* just need to free up the vnet list */ 438 mutex_lock(&vnet_list_mutex); 439 while (!list_empty(&vnet_list)) { 440 vp = list_first_entry(&vnet_list, struct vnet, list); 441 list_del(&vp->list); 442 /* vio_unregister_driver() should have cleaned up port_list */ 443 if (!list_empty(&vp->port_list)) 444 pr_err("Ports not removed by VIO subsystem!\n"); 445 kfree(vp); 446 } 447 mutex_unlock(&vnet_list_mutex); 448 } 449 450 static const struct vio_device_id vsw_port_match[] = { 451 { 452 .type = "vsw-port", 453 }, 454 {}, 455 }; 456 MODULE_DEVICE_TABLE(vio, vsw_port_match); 457 458 static struct vio_driver vsw_port_driver = { 459 .id_table = vsw_port_match, 460 .probe = vsw_port_probe, 461 .remove = vsw_port_remove, 462 .name = "vsw_port", 463 }; 464 465 static int __init vsw_init(void) 466 { 467 pr_info("%s\n", version); 468 return vio_register_driver(&vsw_port_driver); 469 } 470 471 static void __exit vsw_exit(void) 472 { 473 vio_unregister_driver(&vsw_port_driver); 474 vsw_cleanup(); 475 } 476 477 module_init(vsw_init); 478 module_exit(vsw_exit); 479