1/* sunvnet.c: Sun LDOM Virtual Network Driver.
  2 *
  3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
  4 * Copyright (C) 2016 Oracle. All rights reserved.
  5 */
  6
  7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  8
  9#include <linux/module.h>
 10#include <linux/kernel.h>
 11#include <linux/types.h>
 12#include <linux/slab.h>
 13#include <linux/delay.h>
 14#include <linux/init.h>
 15#include <linux/netdevice.h>
 16#include <linux/ethtool.h>
 17#include <linux/etherdevice.h>
 18#include <linux/mutex.h>
 19#include <linux/highmem.h>
 20#include <linux/if_vlan.h>
 21
 22#if IS_ENABLED(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#include "sunvnet_common.h"
 34
 35/* length of time before we decide the hardware is borked,
 36 * and dev->tx_timeout() should be called to fix the problem
 37 */
 38#define VNET_TX_TIMEOUT			(5 * HZ)
 39
 40#define DRV_MODULE_NAME		"sunvnet"
 41#define DRV_MODULE_VERSION	"1.0"
 42#define DRV_MODULE_RELDATE	"June 25, 2007"
 43
 44static char version[] =
 45	DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
 46MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
 47MODULE_DESCRIPTION("Sun LDOM virtual network driver");
 48MODULE_LICENSE("GPL");
 49MODULE_VERSION(DRV_MODULE_VERSION);
 50
 51/* Ordered from largest major to lowest */
 52static struct vio_version vnet_versions[] = {
 53	{ .major = 1, .minor = 8 },
 54	{ .major = 1, .minor = 7 },
 55	{ .major = 1, .minor = 6 },
 56	{ .major = 1, .minor = 0 },
 57};
 58
 59static void vnet_get_drvinfo(struct net_device *dev,
 60			     struct ethtool_drvinfo *info)
 61{
 62	strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
 63	strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
 64}
 65
 66static u32 vnet_get_msglevel(struct net_device *dev)
 67{
 68	struct vnet *vp = netdev_priv(dev);
 69
 70	return vp->msg_enable;
 71}
 72
 73static void vnet_set_msglevel(struct net_device *dev, u32 value)
 74{
 75	struct vnet *vp = netdev_priv(dev);
 76
 77	vp->msg_enable = value;
 78}
 79
 80static const struct ethtool_ops vnet_ethtool_ops = {
 81	.get_drvinfo		= vnet_get_drvinfo,
 82	.get_msglevel		= vnet_get_msglevel,
 83	.set_msglevel		= vnet_set_msglevel,
 84	.get_link		= ethtool_op_get_link,
 85};
 86
 87static LIST_HEAD(vnet_list);
 88static DEFINE_MUTEX(vnet_list_mutex);
 89
 90static struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
 91{
 92	unsigned int hash = vnet_hashfn(skb->data);
 93	struct hlist_head *hp = &vp->port_hash[hash];
 94	struct vnet_port *port;
 95
 96	hlist_for_each_entry_rcu(port, hp, hash) {
 97		if (!sunvnet_port_is_up_common(port))
 98			continue;
 99		if (ether_addr_equal(port->raddr, skb->data))
100			return port;
101	}
102	list_for_each_entry_rcu(port, &vp->port_list, list) {
103		if (!port->switch_port)
104			continue;
105		if (!sunvnet_port_is_up_common(port))
106			continue;
107		return port;
108	}
109	return NULL;
110}
111
112/* func arg to vnet_start_xmit_common() to get the proper tx port */
113static struct vnet_port *vnet_tx_port_find(struct sk_buff *skb,
114					   struct net_device *dev)
115{
116	struct vnet *vp = netdev_priv(dev);
117
118	return __tx_port_find(vp, skb);
119}
120
121static u16 vnet_select_queue(struct net_device *dev, struct sk_buff *skb,
122			     void *accel_priv, select_queue_fallback_t fallback)
123{
124	struct vnet *vp = netdev_priv(dev);
125	struct vnet_port *port = __tx_port_find(vp, skb);
126
127	if (!port)
128		return 0;
129
130	return port->q_index;
131}
132
133/* Wrappers to common functions */
134static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
135{
136	return sunvnet_start_xmit_common(skb, dev, vnet_tx_port_find);
137}
138
139static void vnet_set_rx_mode(struct net_device *dev)
140{
141	struct vnet *vp = netdev_priv(dev);
142
143	return sunvnet_set_rx_mode_common(dev, vp);
144}
145
146#ifdef CONFIG_NET_POLL_CONTROLLER
147static void vnet_poll_controller(struct net_device *dev)
148{
149	struct vnet *vp = netdev_priv(dev);
150
151	return sunvnet_poll_controller_common(dev, vp);
152}
153#endif
154
155static const struct net_device_ops vnet_ops = {
156	.ndo_open		= sunvnet_open_common,
157	.ndo_stop		= sunvnet_close_common,
158	.ndo_set_rx_mode	= vnet_set_rx_mode,
159	.ndo_set_mac_address	= sunvnet_set_mac_addr_common,
160	.ndo_validate_addr	= eth_validate_addr,
161	.ndo_tx_timeout		= sunvnet_tx_timeout_common,
162	.ndo_change_mtu		= sunvnet_change_mtu_common,
163	.ndo_start_xmit		= vnet_start_xmit,
164	.ndo_select_queue	= vnet_select_queue,
165#ifdef CONFIG_NET_POLL_CONTROLLER
166	.ndo_poll_controller	= vnet_poll_controller,
167#endif
168};
169
170static struct vnet *vnet_new(const u64 *local_mac,
171			     struct vio_dev *vdev)
172{
173	struct net_device *dev;
174	struct vnet *vp;
175	int err, i;
176
177	dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1);
178	if (!dev)
179		return ERR_PTR(-ENOMEM);
180	dev->needed_headroom = VNET_PACKET_SKIP + 8;
181	dev->needed_tailroom = 8;
182
183	for (i = 0; i < ETH_ALEN; i++)
184		dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
185
186	vp = netdev_priv(dev);
187
188	spin_lock_init(&vp->lock);
189	vp->dev = dev;
190
191	INIT_LIST_HEAD(&vp->port_list);
192	for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
193		INIT_HLIST_HEAD(&vp->port_hash[i]);
194	INIT_LIST_HEAD(&vp->list);
195	vp->local_mac = *local_mac;
196
197	dev->netdev_ops = &vnet_ops;
198	dev->ethtool_ops = &vnet_ethtool_ops;
199	dev->watchdog_timeo = VNET_TX_TIMEOUT;
200
201	dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE |
202			   NETIF_F_HW_CSUM | NETIF_F_SG;
203	dev->features = dev->hw_features;
204
205	SET_NETDEV_DEV(dev, &vdev->dev);
206
207	err = register_netdev(dev);
208	if (err) {
209		pr_err("Cannot register net device, aborting\n");
210		goto err_out_free_dev;
211	}
212
213	netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
214
215	list_add(&vp->list, &vnet_list);
216
217	return vp;
218
219err_out_free_dev:
220	free_netdev(dev);
221
222	return ERR_PTR(err);
223}
224
225static struct vnet *vnet_find_or_create(const u64 *local_mac,
226					struct vio_dev *vdev)
227{
228	struct vnet *iter, *vp;
229
230	mutex_lock(&vnet_list_mutex);
231	vp = NULL;
232	list_for_each_entry(iter, &vnet_list, list) {
233		if (iter->local_mac == *local_mac) {
234			vp = iter;
235			break;
236		}
237	}
238	if (!vp)
239		vp = vnet_new(local_mac, vdev);
240	mutex_unlock(&vnet_list_mutex);
241
242	return vp;
243}
244
245static void vnet_cleanup(void)
246{
247	struct vnet *vp;
248	struct net_device *dev;
249
250	mutex_lock(&vnet_list_mutex);
251	while (!list_empty(&vnet_list)) {
252		vp = list_first_entry(&vnet_list, struct vnet, list);
253		list_del(&vp->list);
254		dev = vp->dev;
255		/* vio_unregister_driver() should have cleaned up port_list */
256		BUG_ON(!list_empty(&vp->port_list));
257		unregister_netdev(dev);
258		free_netdev(dev);
259	}
260	mutex_unlock(&vnet_list_mutex);
261}
262
263static const char *local_mac_prop = "local-mac-address";
264
265static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
266				     u64 port_node,
267				     struct vio_dev *vdev)
268{
269	const u64 *local_mac = NULL;
270	u64 a;
271
272	mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
273		u64 target = mdesc_arc_target(hp, a);
274		const char *name;
275
276		name = mdesc_get_property(hp, target, "name", NULL);
277		if (!name || strcmp(name, "network"))
278			continue;
279
280		local_mac = mdesc_get_property(hp, target,
281					       local_mac_prop, NULL);
282		if (local_mac)
283			break;
284	}
285	if (!local_mac)
286		return ERR_PTR(-ENODEV);
287
288	return vnet_find_or_create(local_mac, vdev);
289}
290
291static struct ldc_channel_config vnet_ldc_cfg = {
292	.event		= sunvnet_event_common,
293	.mtu		= 64,
294	.mode		= LDC_MODE_UNRELIABLE,
295};
296
297static struct vio_driver_ops vnet_vio_ops = {
298	.send_attr		= sunvnet_send_attr_common,
299	.handle_attr		= sunvnet_handle_attr_common,
300	.handshake_complete	= sunvnet_handshake_complete_common,
301};
302
303static void print_version(void)
304{
305	printk_once(KERN_INFO "%s", version);
306}
307
308const char *remote_macaddr_prop = "remote-mac-address";
309
310static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
311{
312	struct mdesc_handle *hp;
313	struct vnet_port *port;
314	unsigned long flags;
315	struct vnet *vp;
316	const u64 *rmac;
317	int len, i, err, switch_port;
318
319	print_version();
320
321	hp = mdesc_grab();
322
323	vp = vnet_find_parent(hp, vdev->mp, vdev);
324	if (IS_ERR(vp)) {
325		pr_err("Cannot find port parent vnet\n");
326		err = PTR_ERR(vp);
327		goto err_out_put_mdesc;
328	}
329
330	rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
331	err = -ENODEV;
332	if (!rmac) {
333		pr_err("Port lacks %s property\n", remote_macaddr_prop);
334		goto err_out_put_mdesc;
335	}
336
337	port = kzalloc(sizeof(*port), GFP_KERNEL);
338	err = -ENOMEM;
339	if (!port)
340		goto err_out_put_mdesc;
341
342	for (i = 0; i < ETH_ALEN; i++)
343		port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
344
345	port->vp = vp;
346
347	err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
348			      vnet_versions, ARRAY_SIZE(vnet_versions),
349			      &vnet_vio_ops, vp->dev->name);
350	if (err)
351		goto err_out_free_port;
352
353	err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
354	if (err)
355		goto err_out_free_port;
356
357	netif_napi_add(port->vp->dev, &port->napi, sunvnet_poll_common,
358		       NAPI_POLL_WEIGHT);
359
360	INIT_HLIST_NODE(&port->hash);
361	INIT_LIST_HEAD(&port->list);
362
363	switch_port = 0;
364	if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL))
365		switch_port = 1;
366	port->switch_port = switch_port;
367	port->tso = true;
368	port->tsolen = 0;
369
370	spin_lock_irqsave(&vp->lock, flags);
371	if (switch_port)
372		list_add_rcu(&port->list, &vp->port_list);
373	else
374		list_add_tail_rcu(&port->list, &vp->port_list);
375	hlist_add_head_rcu(&port->hash,
376			   &vp->port_hash[vnet_hashfn(port->raddr)]);
377	sunvnet_port_add_txq_common(port);
378	spin_unlock_irqrestore(&vp->lock, flags);
379
380	dev_set_drvdata(&vdev->dev, port);
381
382	pr_info("%s: PORT ( remote-mac %pM%s )\n",
383		vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
384
385	setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common,
386		    (unsigned long)port);
387
388	napi_enable(&port->napi);
389	vio_port_up(&port->vio);
390
391	mdesc_release(hp);
392
393	return 0;
394
395err_out_free_port:
396	kfree(port);
397
398err_out_put_mdesc:
399	mdesc_release(hp);
400	return err;
401}
402
403static int vnet_port_remove(struct vio_dev *vdev)
404{
405	struct vnet_port *port = dev_get_drvdata(&vdev->dev);
406
407	if (port) {
408		del_timer_sync(&port->vio.timer);
409
410		napi_disable(&port->napi);
411
412		list_del_rcu(&port->list);
413		hlist_del_rcu(&port->hash);
414
415		synchronize_rcu();
416		del_timer_sync(&port->clean_timer);
417		sunvnet_port_rm_txq_common(port);
418		netif_napi_del(&port->napi);
419		sunvnet_port_free_tx_bufs_common(port);
420		vio_ldc_free(&port->vio);
421
422		dev_set_drvdata(&vdev->dev, NULL);
423
424		kfree(port);
425	}
426	return 0;
427}
428
429static const struct vio_device_id vnet_port_match[] = {
430	{
431		.type = "vnet-port",
432	},
433	{},
434};
435MODULE_DEVICE_TABLE(vio, vnet_port_match);
436
437static struct vio_driver vnet_port_driver = {
438	.id_table	= vnet_port_match,
439	.probe		= vnet_port_probe,
440	.remove		= vnet_port_remove,
441	.name		= "vnet_port",
442};
443
444static int __init vnet_init(void)
445{
446	return vio_register_driver(&vnet_port_driver);
447}
448
449static void __exit vnet_exit(void)
450{
451	vio_unregister_driver(&vnet_port_driver);
452	vnet_cleanup();
453}
454
455module_init(vnet_init);
456module_exit(vnet_exit);