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	int i;
234
235	dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1);
236	if (!dev)
237		return ERR_PTR(-ENOMEM);
238	dev->needed_headroom = VNET_PACKET_SKIP + 8;
239	dev->needed_tailroom = 8;
240
241	for (i = 0; i < ETH_ALEN; i++) {
242		dev->dev_addr[i] = hwaddr[i];
243		dev->perm_addr[i] = dev->dev_addr[i];
244	}
245
246	sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id);
247
248	dev->netdev_ops = &vsw_ops;
249	dev->ethtool_ops = &vsw_ethtool_ops;
250	dev->watchdog_timeo = VSW_TX_TIMEOUT;
251
252	dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG;
253	dev->features = dev->hw_features;
254
255	/* MTU range: 68 - 65535 */
256	dev->min_mtu = ETH_MIN_MTU;
257	dev->max_mtu = VNET_MAX_MTU;
258
259	SET_NETDEV_DEV(dev, &vdev->dev);
260
261	return dev;
262}
263
264static struct ldc_channel_config vsw_ldc_cfg = {
265	.event		= sunvnet_event_common,
266	.mtu		= 64,
267	.mode		= LDC_MODE_UNRELIABLE,
268};
269
270static struct vio_driver_ops vsw_vio_ops = {
271	.send_attr		= sunvnet_send_attr_common,
272	.handle_attr		= sunvnet_handle_attr_common,
273	.handshake_complete	= sunvnet_handshake_complete_common,
274};
275
276static const char *remote_macaddr_prop = "remote-mac-address";
277static const char *id_prop = "id";
278
279static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
280{
281	struct mdesc_handle *hp;
282	struct vnet_port *port;
283	unsigned long flags;
284	struct vnet *vp;
285	struct net_device *dev;
286	const u64 *rmac;
287	int len, i, err;
288	const u64 *port_id;
289	u64 handle;
290
291	hp = mdesc_grab();
292
293	if (!hp)
294		return -ENODEV;
295
296	rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
297	err = -ENODEV;
298	if (!rmac) {
299		pr_err("Port lacks %s property\n", remote_macaddr_prop);
300		mdesc_release(hp);
301		return err;
302	}
303
304	port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL);
305	err = -ENODEV;
306	if (!port_id) {
307		pr_err("Port lacks %s property\n", id_prop);
308		mdesc_release(hp);
309		return err;
310	}
311
312	/* Get (or create) the vnet associated with this port */
313	vp = vsw_get_vnet(hp, vdev->mp, &handle);
314	if (IS_ERR(vp)) {
315		err = PTR_ERR(vp);
316		pr_err("Failed to get vnet for vsw-port\n");
317		mdesc_release(hp);
318		return err;
319	}
320
321	mdesc_release(hp);
322
323	dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id);
324	if (IS_ERR(dev)) {
325		err = PTR_ERR(dev);
326		pr_err("Failed to alloc netdev for vsw-port\n");
327		return err;
328	}
329
330	port = netdev_priv(dev);
331
332	INIT_LIST_HEAD(&port->list);
333
334	for (i = 0; i < ETH_ALEN; i++)
335		port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
336
337	port->vp = vp;
338	port->dev = dev;
339	port->switch_port = 1;
340	port->tso = false; /* no tso in vsw, misbehaves in bridge */
341	port->tsolen = 0;
342
343	/* Mark the port as belonging to ldmvsw which directs the
344	 * the common code to use the net_device in the vnet_port
345	 * rather than the net_device in the vnet (which is used
346	 * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE
347	 * macro.
348	 */
349	port->vsw = 1;
350
351	err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
352			      vsw_versions, ARRAY_SIZE(vsw_versions),
353			      &vsw_vio_ops, dev->name);
354	if (err)
355		goto err_out_free_dev;
356
357	err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port);
358	if (err)
359		goto err_out_free_dev;
360
361	dev_set_drvdata(&vdev->dev, port);
362
363	netif_napi_add(dev, &port->napi, sunvnet_poll_common,
364		       NAPI_POLL_WEIGHT);
365
366	spin_lock_irqsave(&vp->lock, flags);
367	list_add_rcu(&port->list, &vp->port_list);
368	spin_unlock_irqrestore(&vp->lock, flags);
369
370	timer_setup(&port->clean_timer, sunvnet_clean_timer_expire_common, 0);
371
372	err = register_netdev(dev);
373	if (err) {
374		pr_err("Cannot register net device, aborting\n");
375		goto err_out_del_timer;
376	}
377
378	spin_lock_irqsave(&vp->lock, flags);
379	sunvnet_port_add_txq_common(port);
380	spin_unlock_irqrestore(&vp->lock, flags);
381
382	napi_enable(&port->napi);
383	vio_port_up(&port->vio);
384
385	/* assure no carrier until we receive an LDC_EVENT_UP,
386	 * even if the vsw config script tries to force us up
387	 */
388	netif_carrier_off(dev);
389
390	netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr);
391
392	pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name,
393		port->raddr, " switch-port");
394
395	return 0;
396
397err_out_del_timer:
398	del_timer_sync(&port->clean_timer);
399	list_del_rcu(&port->list);
400	synchronize_rcu();
401	netif_napi_del(&port->napi);
402	dev_set_drvdata(&vdev->dev, NULL);
403	vio_ldc_free(&port->vio);
404
405err_out_free_dev:
406	free_netdev(dev);
407	return err;
408}
409
410static int vsw_port_remove(struct vio_dev *vdev)
411{
412	struct vnet_port *port = dev_get_drvdata(&vdev->dev);
413	unsigned long flags;
414
415	if (port) {
416		del_timer_sync(&port->vio.timer);
417		del_timer_sync(&port->clean_timer);
418
419		napi_disable(&port->napi);
420		unregister_netdev(port->dev);
421
422		list_del_rcu(&port->list);
423
424		synchronize_rcu();
425		spin_lock_irqsave(&port->vp->lock, flags);
426		sunvnet_port_rm_txq_common(port);
427		spin_unlock_irqrestore(&port->vp->lock, flags);
428		netif_napi_del(&port->napi);
429		sunvnet_port_free_tx_bufs_common(port);
430		vio_ldc_free(&port->vio);
431
432		dev_set_drvdata(&vdev->dev, NULL);
433
434		free_netdev(port->dev);
435	}
436
437	return 0;
438}
439
440static void vsw_cleanup(void)
441{
442	struct vnet *vp;
443
444	/* just need to free up the vnet list */
445	mutex_lock(&vnet_list_mutex);
446	while (!list_empty(&vnet_list)) {
447		vp = list_first_entry(&vnet_list, struct vnet, list);
448		list_del(&vp->list);
449		/* vio_unregister_driver() should have cleaned up port_list */
450		if (!list_empty(&vp->port_list))
451			pr_err("Ports not removed by VIO subsystem!\n");
452		kfree(vp);
453	}
454	mutex_unlock(&vnet_list_mutex);
455}
456
457static const struct vio_device_id vsw_port_match[] = {
458	{
459		.type = "vsw-port",
460	},
461	{},
462};
463MODULE_DEVICE_TABLE(vio, vsw_port_match);
464
465static struct vio_driver vsw_port_driver = {
466	.id_table	= vsw_port_match,
467	.probe		= vsw_port_probe,
468	.remove		= vsw_port_remove,
469	.name		= "vsw_port",
470};
471
472static int __init vsw_init(void)
473{
474	pr_info("%s\n", version);
475	return vio_register_driver(&vsw_port_driver);
476}
477
478static void __exit vsw_exit(void)
479{
480	vio_unregister_driver(&vsw_port_driver);
481	vsw_cleanup();
482}
483
484module_init(vsw_init);
485module_exit(vsw_exit);
486