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1// SPDX-License-Identifier: GPL-2.02/* 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 ": " fmt9 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#endif26 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 problem38 */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 45static char version[] =46 DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")";47MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");48MODULE_DESCRIPTION("Sun LDOM virtual network driver");49MODULE_LICENSE("GPL");50MODULE_VERSION(DRV_MODULE_VERSION);51 52/* Ordered from largest major to lowest */53static 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 60static 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 67static u32 vnet_get_msglevel(struct net_device *dev)68{69 struct vnet *vp = netdev_priv(dev);70 71 return vp->msg_enable;72}73 74static 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 81static 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 100static 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 113static 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 143static 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 178static 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 188static LIST_HEAD(vnet_list);189static DEFINE_MUTEX(vnet_list_mutex);190 191static 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 */214static 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 222static 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 */235static 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 240static 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_CONTROLLER248static 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#endif255 256static 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_CONTROLLER266 .ndo_poll_controller = vnet_poll_controller,267#endif268};269 270static 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 325err_out_free_dev:326 free_netdev(dev);327 328 return ERR_PTR(err);329}330 331static 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 351static 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 369static const char *local_mac_prop = "local-mac-address";370 371static 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 397static struct ldc_channel_config vnet_ldc_cfg = {398 .event = sunvnet_event_common,399 .mtu = 64,400 .mode = LDC_MODE_UNRELIABLE,401};402 403static 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 409const char *remote_macaddr_prop = "remote-mac-address";410 411static 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 else475 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 495err_out_free_port:496 kfree(port);497 498err_out_put_mdesc:499 mdesc_release(hp);500 return err;501}502 503static 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 528static const struct vio_device_id vnet_port_match[] = {529 {530 .type = "vnet-port",531 },532 {},533};534MODULE_DEVICE_TABLE(vio, vnet_port_match);535 536static 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 543static int __init vnet_init(void)544{545 pr_info("%s\n", version);546 return vio_register_driver(&vnet_port_driver);547}548 549static void __exit vnet_exit(void)550{551 vio_unregister_driver(&vnet_port_driver);552 vnet_cleanup();553}554 555module_init(vnet_init);556module_exit(vnet_exit);557