1 // SPDX-License-Identifier: GPL-2.0 2 /* sunvnet.c: Sun LDOM Virtual Network Driver. 3 * 4 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> 5 * Copyright (C) 2016-2017 Oracle. All rights reserved. 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/module.h> 11 #include <linux/kernel.h> 12 #include <linux/types.h> 13 #include <linux/slab.h> 14 #include <linux/delay.h> 15 #include <linux/init.h> 16 #include <linux/netdevice.h> 17 #include <linux/ethtool.h> 18 #include <linux/etherdevice.h> 19 #include <linux/mutex.h> 20 #include <linux/highmem.h> 21 #include <linux/if_vlan.h> 22 23 #if IS_ENABLED(CONFIG_IPV6) 24 #include <linux/icmpv6.h> 25 #endif 26 27 #include <net/ip.h> 28 #include <net/icmp.h> 29 #include <net/route.h> 30 31 #include <asm/vio.h> 32 #include <asm/ldc.h> 33 34 #include "sunvnet_common.h" 35 36 /* length of time before we decide the hardware is borked, 37 * and dev->tx_timeout() should be called to fix the problem 38 */ 39 #define VNET_TX_TIMEOUT (5 * HZ) 40 41 #define DRV_MODULE_NAME "sunvnet" 42 #define DRV_MODULE_VERSION "2.0" 43 #define DRV_MODULE_RELDATE "February 3, 2017" 44 45 static char version[] = 46 DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")"; 47 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); 48 MODULE_DESCRIPTION("Sun LDOM virtual network driver"); 49 MODULE_LICENSE("GPL"); 50 MODULE_VERSION(DRV_MODULE_VERSION); 51 52 /* Ordered from largest major to lowest */ 53 static struct vio_version vnet_versions[] = { 54 { .major = 1, .minor = 8 }, 55 { .major = 1, .minor = 7 }, 56 { .major = 1, .minor = 6 }, 57 { .major = 1, .minor = 0 }, 58 }; 59 60 static void vnet_get_drvinfo(struct net_device *dev, 61 struct ethtool_drvinfo *info) 62 { 63 strscpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver)); 64 strscpy(info->version, DRV_MODULE_VERSION, sizeof(info->version)); 65 } 66 67 static u32 vnet_get_msglevel(struct net_device *dev) 68 { 69 struct vnet *vp = netdev_priv(dev); 70 71 return vp->msg_enable; 72 } 73 74 static void vnet_set_msglevel(struct net_device *dev, u32 value) 75 { 76 struct vnet *vp = netdev_priv(dev); 77 78 vp->msg_enable = value; 79 } 80 81 static const struct { 82 const char string[ETH_GSTRING_LEN]; 83 } ethtool_stats_keys[] = { 84 { "rx_packets" }, 85 { "tx_packets" }, 86 { "rx_bytes" }, 87 { "tx_bytes" }, 88 { "rx_errors" }, 89 { "tx_errors" }, 90 { "rx_dropped" }, 91 { "tx_dropped" }, 92 { "multicast" }, 93 { "rx_length_errors" }, 94 { "rx_frame_errors" }, 95 { "rx_missed_errors" }, 96 { "tx_carrier_errors" }, 97 { "nports" }, 98 }; 99 100 static int vnet_get_sset_count(struct net_device *dev, int sset) 101 { 102 struct vnet *vp = (struct vnet *)netdev_priv(dev); 103 104 switch (sset) { 105 case ETH_SS_STATS: 106 return ARRAY_SIZE(ethtool_stats_keys) 107 + (NUM_VNET_PORT_STATS * vp->nports); 108 default: 109 return -EOPNOTSUPP; 110 } 111 } 112 113 static void vnet_get_strings(struct net_device *dev, u32 stringset, u8 *buf) 114 { 115 struct vnet *vp = (struct vnet *)netdev_priv(dev); 116 struct vnet_port *port; 117 118 switch (stringset) { 119 case ETH_SS_STATS: 120 memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys)); 121 buf += sizeof(ethtool_stats_keys); 122 123 rcu_read_lock(); 124 list_for_each_entry_rcu(port, &vp->port_list, list) { 125 ethtool_sprintf(&buf, "p%u.%s-%pM", port->q_index, 126 port->switch_port ? "s" : "q", 127 port->raddr); 128 ethtool_sprintf(&buf, "p%u.rx_packets", port->q_index); 129 ethtool_sprintf(&buf, "p%u.tx_packets", port->q_index); 130 ethtool_sprintf(&buf, "p%u.rx_bytes", port->q_index); 131 ethtool_sprintf(&buf, "p%u.tx_bytes", port->q_index); 132 ethtool_sprintf(&buf, "p%u.event_up", port->q_index); 133 ethtool_sprintf(&buf, "p%u.event_reset", port->q_index); 134 } 135 rcu_read_unlock(); 136 break; 137 default: 138 WARN_ON(1); 139 break; 140 } 141 } 142 143 static void vnet_get_ethtool_stats(struct net_device *dev, 144 struct ethtool_stats *estats, u64 *data) 145 { 146 struct vnet *vp = (struct vnet *)netdev_priv(dev); 147 struct vnet_port *port; 148 int i = 0; 149 150 data[i++] = dev->stats.rx_packets; 151 data[i++] = dev->stats.tx_packets; 152 data[i++] = dev->stats.rx_bytes; 153 data[i++] = dev->stats.tx_bytes; 154 data[i++] = dev->stats.rx_errors; 155 data[i++] = dev->stats.tx_errors; 156 data[i++] = dev->stats.rx_dropped; 157 data[i++] = dev->stats.tx_dropped; 158 data[i++] = dev->stats.multicast; 159 data[i++] = dev->stats.rx_length_errors; 160 data[i++] = dev->stats.rx_frame_errors; 161 data[i++] = dev->stats.rx_missed_errors; 162 data[i++] = dev->stats.tx_carrier_errors; 163 data[i++] = vp->nports; 164 165 rcu_read_lock(); 166 list_for_each_entry_rcu(port, &vp->port_list, list) { 167 data[i++] = port->q_index; 168 data[i++] = port->stats.rx_packets; 169 data[i++] = port->stats.tx_packets; 170 data[i++] = port->stats.rx_bytes; 171 data[i++] = port->stats.tx_bytes; 172 data[i++] = port->stats.event_up; 173 data[i++] = port->stats.event_reset; 174 } 175 rcu_read_unlock(); 176 } 177 178 static const struct ethtool_ops vnet_ethtool_ops = { 179 .get_drvinfo = vnet_get_drvinfo, 180 .get_msglevel = vnet_get_msglevel, 181 .set_msglevel = vnet_set_msglevel, 182 .get_link = ethtool_op_get_link, 183 .get_sset_count = vnet_get_sset_count, 184 .get_strings = vnet_get_strings, 185 .get_ethtool_stats = vnet_get_ethtool_stats, 186 }; 187 188 static LIST_HEAD(vnet_list); 189 static DEFINE_MUTEX(vnet_list_mutex); 190 191 static struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb) 192 { 193 unsigned int hash = vnet_hashfn(skb->data); 194 struct hlist_head *hp = &vp->port_hash[hash]; 195 struct vnet_port *port; 196 197 hlist_for_each_entry_rcu(port, hp, hash) { 198 if (!sunvnet_port_is_up_common(port)) 199 continue; 200 if (ether_addr_equal(port->raddr, skb->data)) 201 return port; 202 } 203 list_for_each_entry_rcu(port, &vp->port_list, list) { 204 if (!port->switch_port) 205 continue; 206 if (!sunvnet_port_is_up_common(port)) 207 continue; 208 return port; 209 } 210 return NULL; 211 } 212 213 /* func arg to vnet_start_xmit_common() to get the proper tx port */ 214 static struct vnet_port *vnet_tx_port_find(struct sk_buff *skb, 215 struct net_device *dev) 216 { 217 struct vnet *vp = netdev_priv(dev); 218 219 return __tx_port_find(vp, skb); 220 } 221 222 static u16 vnet_select_queue(struct net_device *dev, struct sk_buff *skb, 223 struct net_device *sb_dev) 224 { 225 struct vnet *vp = netdev_priv(dev); 226 struct vnet_port *port = __tx_port_find(vp, skb); 227 228 if (!port) 229 return 0; 230 231 return port->q_index; 232 } 233 234 /* Wrappers to common functions */ 235 static netdev_tx_t vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) 236 { 237 return sunvnet_start_xmit_common(skb, dev, vnet_tx_port_find); 238 } 239 240 static void vnet_set_rx_mode(struct net_device *dev) 241 { 242 struct vnet *vp = netdev_priv(dev); 243 244 return sunvnet_set_rx_mode_common(dev, vp); 245 } 246 247 #ifdef CONFIG_NET_POLL_CONTROLLER 248 static void vnet_poll_controller(struct net_device *dev) 249 { 250 struct vnet *vp = netdev_priv(dev); 251 252 return sunvnet_poll_controller_common(dev, vp); 253 } 254 #endif 255 256 static const struct net_device_ops vnet_ops = { 257 .ndo_open = sunvnet_open_common, 258 .ndo_stop = sunvnet_close_common, 259 .ndo_set_rx_mode = vnet_set_rx_mode, 260 .ndo_set_mac_address = sunvnet_set_mac_addr_common, 261 .ndo_validate_addr = eth_validate_addr, 262 .ndo_tx_timeout = sunvnet_tx_timeout_common, 263 .ndo_start_xmit = vnet_start_xmit, 264 .ndo_select_queue = vnet_select_queue, 265 #ifdef CONFIG_NET_POLL_CONTROLLER 266 .ndo_poll_controller = vnet_poll_controller, 267 #endif 268 }; 269 270 static struct vnet *vnet_new(const u64 *local_mac, 271 struct vio_dev *vdev) 272 { 273 struct net_device *dev; 274 u8 addr[ETH_ALEN]; 275 struct vnet *vp; 276 int err, i; 277 278 dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1); 279 if (!dev) 280 return ERR_PTR(-ENOMEM); 281 dev->needed_headroom = VNET_PACKET_SKIP + 8; 282 dev->needed_tailroom = 8; 283 284 for (i = 0; i < ETH_ALEN; i++) 285 addr[i] = (*local_mac >> (5 - i) * 8) & 0xff; 286 eth_hw_addr_set(dev, addr); 287 288 vp = netdev_priv(dev); 289 290 spin_lock_init(&vp->lock); 291 vp->dev = dev; 292 293 INIT_LIST_HEAD(&vp->port_list); 294 for (i = 0; i < VNET_PORT_HASH_SIZE; i++) 295 INIT_HLIST_HEAD(&vp->port_hash[i]); 296 INIT_LIST_HEAD(&vp->list); 297 vp->local_mac = *local_mac; 298 299 dev->netdev_ops = &vnet_ops; 300 dev->ethtool_ops = &vnet_ethtool_ops; 301 dev->watchdog_timeo = VNET_TX_TIMEOUT; 302 303 dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_ALL_TSO | 304 NETIF_F_HW_CSUM | NETIF_F_SG; 305 dev->features = dev->hw_features; 306 307 /* MTU range: 68 - 65535 */ 308 dev->min_mtu = ETH_MIN_MTU; 309 dev->max_mtu = VNET_MAX_MTU; 310 311 SET_NETDEV_DEV(dev, &vdev->dev); 312 313 err = register_netdev(dev); 314 if (err) { 315 pr_err("Cannot register net device, aborting\n"); 316 goto err_out_free_dev; 317 } 318 319 netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr); 320 321 list_add(&vp->list, &vnet_list); 322 323 return vp; 324 325 err_out_free_dev: 326 free_netdev(dev); 327 328 return ERR_PTR(err); 329 } 330 331 static struct vnet *vnet_find_or_create(const u64 *local_mac, 332 struct vio_dev *vdev) 333 { 334 struct vnet *iter, *vp; 335 336 mutex_lock(&vnet_list_mutex); 337 vp = NULL; 338 list_for_each_entry(iter, &vnet_list, list) { 339 if (iter->local_mac == *local_mac) { 340 vp = iter; 341 break; 342 } 343 } 344 if (!vp) 345 vp = vnet_new(local_mac, vdev); 346 mutex_unlock(&vnet_list_mutex); 347 348 return vp; 349 } 350 351 static void vnet_cleanup(void) 352 { 353 struct vnet *vp; 354 struct net_device *dev; 355 356 mutex_lock(&vnet_list_mutex); 357 while (!list_empty(&vnet_list)) { 358 vp = list_first_entry(&vnet_list, struct vnet, list); 359 list_del(&vp->list); 360 dev = vp->dev; 361 /* vio_unregister_driver() should have cleaned up port_list */ 362 BUG_ON(!list_empty(&vp->port_list)); 363 unregister_netdev(dev); 364 free_netdev(dev); 365 } 366 mutex_unlock(&vnet_list_mutex); 367 } 368 369 static const char *local_mac_prop = "local-mac-address"; 370 371 static struct vnet *vnet_find_parent(struct mdesc_handle *hp, 372 u64 port_node, 373 struct vio_dev *vdev) 374 { 375 const u64 *local_mac = NULL; 376 u64 a; 377 378 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) { 379 u64 target = mdesc_arc_target(hp, a); 380 const char *name; 381 382 name = mdesc_get_property(hp, target, "name", NULL); 383 if (!name || strcmp(name, "network")) 384 continue; 385 386 local_mac = mdesc_get_property(hp, target, 387 local_mac_prop, NULL); 388 if (local_mac) 389 break; 390 } 391 if (!local_mac) 392 return ERR_PTR(-ENODEV); 393 394 return vnet_find_or_create(local_mac, vdev); 395 } 396 397 static struct ldc_channel_config vnet_ldc_cfg = { 398 .event = sunvnet_event_common, 399 .mtu = 64, 400 .mode = LDC_MODE_UNRELIABLE, 401 }; 402 403 static struct vio_driver_ops vnet_vio_ops = { 404 .send_attr = sunvnet_send_attr_common, 405 .handle_attr = sunvnet_handle_attr_common, 406 .handshake_complete = sunvnet_handshake_complete_common, 407 }; 408 409 const char *remote_macaddr_prop = "remote-mac-address"; 410 411 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) 412 { 413 struct mdesc_handle *hp; 414 struct vnet_port *port; 415 unsigned long flags; 416 struct vnet *vp; 417 const u64 *rmac; 418 int len, i, err, switch_port; 419 420 hp = mdesc_grab(); 421 422 if (!hp) 423 return -ENODEV; 424 425 vp = vnet_find_parent(hp, vdev->mp, vdev); 426 if (IS_ERR(vp)) { 427 pr_err("Cannot find port parent vnet\n"); 428 err = PTR_ERR(vp); 429 goto err_out_put_mdesc; 430 } 431 432 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); 433 err = -ENODEV; 434 if (!rmac) { 435 pr_err("Port lacks %s property\n", remote_macaddr_prop); 436 goto err_out_put_mdesc; 437 } 438 439 port = kzalloc(sizeof(*port), GFP_KERNEL); 440 err = -ENOMEM; 441 if (!port) 442 goto err_out_put_mdesc; 443 444 for (i = 0; i < ETH_ALEN; i++) 445 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; 446 447 port->vp = vp; 448 449 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, 450 vnet_versions, ARRAY_SIZE(vnet_versions), 451 &vnet_vio_ops, vp->dev->name); 452 if (err) 453 goto err_out_free_port; 454 455 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port); 456 if (err) 457 goto err_out_free_port; 458 459 netif_napi_add(port->vp->dev, &port->napi, sunvnet_poll_common); 460 461 INIT_HLIST_NODE(&port->hash); 462 INIT_LIST_HEAD(&port->list); 463 464 switch_port = 0; 465 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL)) 466 switch_port = 1; 467 port->switch_port = switch_port; 468 port->tso = true; 469 port->tsolen = 0; 470 471 spin_lock_irqsave(&vp->lock, flags); 472 if (switch_port) 473 list_add_rcu(&port->list, &vp->port_list); 474 else 475 list_add_tail_rcu(&port->list, &vp->port_list); 476 hlist_add_head_rcu(&port->hash, 477 &vp->port_hash[vnet_hashfn(port->raddr)]); 478 sunvnet_port_add_txq_common(port); 479 spin_unlock_irqrestore(&vp->lock, flags); 480 481 dev_set_drvdata(&vdev->dev, port); 482 483 pr_info("%s: PORT ( remote-mac %pM%s )\n", 484 vp->dev->name, port->raddr, switch_port ? " switch-port" : ""); 485 486 timer_setup(&port->clean_timer, sunvnet_clean_timer_expire_common, 0); 487 488 napi_enable(&port->napi); 489 vio_port_up(&port->vio); 490 491 mdesc_release(hp); 492 493 return 0; 494 495 err_out_free_port: 496 kfree(port); 497 498 err_out_put_mdesc: 499 mdesc_release(hp); 500 return err; 501 } 502 503 static void vnet_port_remove(struct vio_dev *vdev) 504 { 505 struct vnet_port *port = dev_get_drvdata(&vdev->dev); 506 507 if (port) { 508 del_timer_sync(&port->vio.timer); 509 510 napi_disable(&port->napi); 511 512 list_del_rcu(&port->list); 513 hlist_del_rcu(&port->hash); 514 515 synchronize_rcu(); 516 timer_shutdown_sync(&port->clean_timer); 517 sunvnet_port_rm_txq_common(port); 518 netif_napi_del(&port->napi); 519 sunvnet_port_free_tx_bufs_common(port); 520 vio_ldc_free(&port->vio); 521 522 dev_set_drvdata(&vdev->dev, NULL); 523 524 kfree(port); 525 } 526 } 527 528 static const struct vio_device_id vnet_port_match[] = { 529 { 530 .type = "vnet-port", 531 }, 532 {}, 533 }; 534 MODULE_DEVICE_TABLE(vio, vnet_port_match); 535 536 static struct vio_driver vnet_port_driver = { 537 .id_table = vnet_port_match, 538 .probe = vnet_port_probe, 539 .remove = vnet_port_remove, 540 .name = "vnet_port", 541 }; 542 543 static int __init vnet_init(void) 544 { 545 pr_info("%s\n", version); 546 return vio_register_driver(&vnet_port_driver); 547 } 548 549 static void __exit vnet_exit(void) 550 { 551 vio_unregister_driver(&vnet_port_driver); 552 vnet_cleanup(); 553 } 554 555 module_init(vnet_init); 556 module_exit(vnet_exit); 557