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1// SPDX-License-Identifier: GPL-2.02/* 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 ": " fmt8 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#endif25 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 */42static 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 48static char version[] =49 DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")";50MODULE_AUTHOR("Oracle");51MODULE_DESCRIPTION("Sun4v LDOM Virtual Switch Driver");52MODULE_LICENSE("GPL");53MODULE_VERSION(DRV_MODULE_VERSION);54 55/* Ordered from largest major to lowest */56static 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 63static 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 70static 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 77static 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 84static 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 91static LIST_HEAD(vnet_list);92static DEFINE_MUTEX(vnet_list_mutex);93 94/* func arg to vnet_start_xmit_common() to get the proper tx port */95static 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 103static 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 */115static 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 120static 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 127static 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_CONTROLLER141static 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#endif148 149static 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_CONTROLLER159 .ndo_poll_controller = vsw_poll_controller,160#endif161};162 163static const char *local_mac_prop = "local-mac-address";164static const char *cfg_handle_prop = "cfg-handle";165 166static 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 225static 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 260static struct ldc_channel_config vsw_ldc_cfg = {261 .event = sunvnet_event_common,262 .mtu = 64,263 .mode = LDC_MODE_UNRELIABLE,264};265 266static 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 272static const char *remote_macaddr_prop = "remote-mac-address";273static const char *id_prop = "id";274 275static 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 the340 * common code to use the net_device in the vnet_port341 * rather than the net_device in the vnet (which is used342 * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE343 * 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 up382 */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 392err_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 400err_out_free_dev:401 free_netdev(dev);402 return err;403}404 405static 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 433static 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 450static const struct vio_device_id vsw_port_match[] = {451 {452 .type = "vsw-port",453 },454 {},455};456MODULE_DEVICE_TABLE(vio, vsw_port_match);457 458static 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 465static int __init vsw_init(void)466{467 pr_info("%s\n", version);468 return vio_register_driver(&vsw_port_driver);469}470 471static void __exit vsw_exit(void)472{473 vio_unregister_driver(&vsw_port_driver);474 vsw_cleanup();475}476 477module_init(vsw_init);478module_exit(vsw_exit);479