cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ldmvsw.c (11511B)


      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 */
     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	strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
     67	strlcpy(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
    127int 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}
    139EXPORT_SYMBOL_GPL(ldmvsw_open);
    140
    141#ifdef CONFIG_NET_POLL_CONTROLLER
    142static 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
    150static 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
    164static const char *local_mac_prop = "local-mac-address";
    165static const char *cfg_handle_prop = "cfg-handle";
    166
    167static 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
    226static 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
    234	dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1);
    235	if (!dev)
    236		return ERR_PTR(-ENOMEM);
    237	dev->needed_headroom = VNET_PACKET_SKIP + 8;
    238	dev->needed_tailroom = 8;
    239
    240	eth_hw_addr_set(dev, hwaddr);
    241	ether_addr_copy(dev->perm_addr, dev->dev_addr);
    242
    243	sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id);
    244
    245	dev->netdev_ops = &vsw_ops;
    246	dev->ethtool_ops = &vsw_ethtool_ops;
    247	dev->watchdog_timeo = VSW_TX_TIMEOUT;
    248
    249	dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG;
    250	dev->features = dev->hw_features;
    251
    252	/* MTU range: 68 - 65535 */
    253	dev->min_mtu = ETH_MIN_MTU;
    254	dev->max_mtu = VNET_MAX_MTU;
    255
    256	SET_NETDEV_DEV(dev, &vdev->dev);
    257
    258	return dev;
    259}
    260
    261static struct ldc_channel_config vsw_ldc_cfg = {
    262	.event		= sunvnet_event_common,
    263	.mtu		= 64,
    264	.mode		= LDC_MODE_UNRELIABLE,
    265};
    266
    267static struct vio_driver_ops vsw_vio_ops = {
    268	.send_attr		= sunvnet_send_attr_common,
    269	.handle_attr		= sunvnet_handle_attr_common,
    270	.handshake_complete	= sunvnet_handshake_complete_common,
    271};
    272
    273static const char *remote_macaddr_prop = "remote-mac-address";
    274static const char *id_prop = "id";
    275
    276static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
    277{
    278	struct mdesc_handle *hp;
    279	struct vnet_port *port;
    280	unsigned long flags;
    281	struct vnet *vp;
    282	struct net_device *dev;
    283	const u64 *rmac;
    284	int len, i, err;
    285	const u64 *port_id;
    286	u64 handle;
    287
    288	hp = mdesc_grab();
    289
    290	rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
    291	err = -ENODEV;
    292	if (!rmac) {
    293		pr_err("Port lacks %s property\n", remote_macaddr_prop);
    294		mdesc_release(hp);
    295		return err;
    296	}
    297
    298	port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL);
    299	err = -ENODEV;
    300	if (!port_id) {
    301		pr_err("Port lacks %s property\n", id_prop);
    302		mdesc_release(hp);
    303		return err;
    304	}
    305
    306	/* Get (or create) the vnet associated with this port */
    307	vp = vsw_get_vnet(hp, vdev->mp, &handle);
    308	if (IS_ERR(vp)) {
    309		err = PTR_ERR(vp);
    310		pr_err("Failed to get vnet for vsw-port\n");
    311		mdesc_release(hp);
    312		return err;
    313	}
    314
    315	mdesc_release(hp);
    316
    317	dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id);
    318	if (IS_ERR(dev)) {
    319		err = PTR_ERR(dev);
    320		pr_err("Failed to alloc netdev for vsw-port\n");
    321		return err;
    322	}
    323
    324	port = netdev_priv(dev);
    325
    326	INIT_LIST_HEAD(&port->list);
    327
    328	for (i = 0; i < ETH_ALEN; i++)
    329		port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
    330
    331	port->vp = vp;
    332	port->dev = dev;
    333	port->switch_port = 1;
    334	port->tso = false; /* no tso in vsw, misbehaves in bridge */
    335	port->tsolen = 0;
    336
    337	/* Mark the port as belonging to ldmvsw which directs the
    338	 * the common code to use the net_device in the vnet_port
    339	 * rather than the net_device in the vnet (which is used
    340	 * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE
    341	 * macro.
    342	 */
    343	port->vsw = 1;
    344
    345	err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
    346			      vsw_versions, ARRAY_SIZE(vsw_versions),
    347			      &vsw_vio_ops, dev->name);
    348	if (err)
    349		goto err_out_free_dev;
    350
    351	err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port);
    352	if (err)
    353		goto err_out_free_dev;
    354
    355	dev_set_drvdata(&vdev->dev, port);
    356
    357	netif_napi_add(dev, &port->napi, sunvnet_poll_common,
    358		       NAPI_POLL_WEIGHT);
    359
    360	spin_lock_irqsave(&vp->lock, flags);
    361	list_add_rcu(&port->list, &vp->port_list);
    362	spin_unlock_irqrestore(&vp->lock, flags);
    363
    364	timer_setup(&port->clean_timer, sunvnet_clean_timer_expire_common, 0);
    365
    366	err = register_netdev(dev);
    367	if (err) {
    368		pr_err("Cannot register net device, aborting\n");
    369		goto err_out_del_timer;
    370	}
    371
    372	spin_lock_irqsave(&vp->lock, flags);
    373	sunvnet_port_add_txq_common(port);
    374	spin_unlock_irqrestore(&vp->lock, flags);
    375
    376	napi_enable(&port->napi);
    377	vio_port_up(&port->vio);
    378
    379	/* assure no carrier until we receive an LDC_EVENT_UP,
    380	 * even if the vsw config script tries to force us up
    381	 */
    382	netif_carrier_off(dev);
    383
    384	netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr);
    385
    386	pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name,
    387		port->raddr, " switch-port");
    388
    389	return 0;
    390
    391err_out_del_timer:
    392	del_timer_sync(&port->clean_timer);
    393	list_del_rcu(&port->list);
    394	synchronize_rcu();
    395	netif_napi_del(&port->napi);
    396	dev_set_drvdata(&vdev->dev, NULL);
    397	vio_ldc_free(&port->vio);
    398
    399err_out_free_dev:
    400	free_netdev(dev);
    401	return err;
    402}
    403
    404static void vsw_port_remove(struct vio_dev *vdev)
    405{
    406	struct vnet_port *port = dev_get_drvdata(&vdev->dev);
    407	unsigned long flags;
    408
    409	if (port) {
    410		del_timer_sync(&port->vio.timer);
    411		del_timer_sync(&port->clean_timer);
    412
    413		napi_disable(&port->napi);
    414		unregister_netdev(port->dev);
    415
    416		list_del_rcu(&port->list);
    417
    418		synchronize_rcu();
    419		spin_lock_irqsave(&port->vp->lock, flags);
    420		sunvnet_port_rm_txq_common(port);
    421		spin_unlock_irqrestore(&port->vp->lock, flags);
    422		netif_napi_del(&port->napi);
    423		sunvnet_port_free_tx_bufs_common(port);
    424		vio_ldc_free(&port->vio);
    425
    426		dev_set_drvdata(&vdev->dev, NULL);
    427
    428		free_netdev(port->dev);
    429	}
    430}
    431
    432static void vsw_cleanup(void)
    433{
    434	struct vnet *vp;
    435
    436	/* just need to free up the vnet list */
    437	mutex_lock(&vnet_list_mutex);
    438	while (!list_empty(&vnet_list)) {
    439		vp = list_first_entry(&vnet_list, struct vnet, list);
    440		list_del(&vp->list);
    441		/* vio_unregister_driver() should have cleaned up port_list */
    442		if (!list_empty(&vp->port_list))
    443			pr_err("Ports not removed by VIO subsystem!\n");
    444		kfree(vp);
    445	}
    446	mutex_unlock(&vnet_list_mutex);
    447}
    448
    449static const struct vio_device_id vsw_port_match[] = {
    450	{
    451		.type = "vsw-port",
    452	},
    453	{},
    454};
    455MODULE_DEVICE_TABLE(vio, vsw_port_match);
    456
    457static struct vio_driver vsw_port_driver = {
    458	.id_table	= vsw_port_match,
    459	.probe		= vsw_port_probe,
    460	.remove		= vsw_port_remove,
    461	.name		= "vsw_port",
    462};
    463
    464static int __init vsw_init(void)
    465{
    466	pr_info("%s\n", version);
    467	return vio_register_driver(&vsw_port_driver);
    468}
    469
    470static void __exit vsw_exit(void)
    471{
    472	vio_unregister_driver(&vsw_port_driver);
    473	vsw_cleanup();
    474}
    475
    476module_init(vsw_init);
    477module_exit(vsw_exit);