summaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/sun/ldmvsw.c
blob: 5b56c24b6ed2e0c45b5a40d32941527bb1539390 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
/* ldmvsw.c: Sun4v LDOM Virtual Switch Driver.
 *
 * Copyright (C) 2016-2017 Oracle. All rights reserved.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/highmem.h>
#include <linux/if_vlan.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/types.h>

#if defined(CONFIG_IPV6)
#include <linux/icmpv6.h>
#endif

#include <net/ip.h>
#include <net/icmp.h>
#include <net/route.h>

#include <asm/vio.h>
#include <asm/ldc.h>

/* This driver makes use of the common code in sunvnet_common.c */
#include "sunvnet_common.h"

/* Length of time before we decide the hardware is hung,
 * and dev->tx_timeout() should be called to fix the problem.
 */
#define VSW_TX_TIMEOUT			(10 * HZ)

/* Static HW Addr used for the network interfaces representing vsw ports */
static u8 vsw_port_hwaddr[ETH_ALEN] = {0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

#define DRV_MODULE_NAME		"ldmvsw"
#define DRV_MODULE_VERSION	"1.2"
#define DRV_MODULE_RELDATE	"March 4, 2017"

static char version[] =
	DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")";
MODULE_AUTHOR("Oracle");
MODULE_DESCRIPTION("Sun4v LDOM Virtual Switch Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);

/* Ordered from largest major to lowest */
static struct vio_version vsw_versions[] = {
	{ .major = 1, .minor = 8 },
	{ .major = 1, .minor = 7 },
	{ .major = 1, .minor = 6 },
	{ .major = 1, .minor = 0 },
};

static void vsw_get_drvinfo(struct net_device *dev,
			    struct ethtool_drvinfo *info)
{
	strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
	strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
}

static u32 vsw_get_msglevel(struct net_device *dev)
{
	struct vnet_port *port = netdev_priv(dev);

	return port->vp->msg_enable;
}

static void vsw_set_msglevel(struct net_device *dev, u32 value)
{
	struct vnet_port *port = netdev_priv(dev);

	port->vp->msg_enable = value;
}

static const struct ethtool_ops vsw_ethtool_ops = {
	.get_drvinfo		= vsw_get_drvinfo,
	.get_msglevel		= vsw_get_msglevel,
	.set_msglevel		= vsw_set_msglevel,
	.get_link		= ethtool_op_get_link,
};

static LIST_HEAD(vnet_list);
static DEFINE_MUTEX(vnet_list_mutex);

/* func arg to vnet_start_xmit_common() to get the proper tx port */
static struct vnet_port *vsw_tx_port_find(struct sk_buff *skb,
					  struct net_device *dev)
{
	struct vnet_port *port = netdev_priv(dev);

	return port;
}

static u16 vsw_select_queue(struct net_device *dev, struct sk_buff *skb,
			    void *accel_priv, select_queue_fallback_t fallback)
{
	struct vnet_port *port = netdev_priv(dev);

	if (!port)
		return 0;

	return port->q_index;
}

/* Wrappers to common functions */
static int vsw_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	return sunvnet_start_xmit_common(skb, dev, vsw_tx_port_find);
}

static void vsw_set_rx_mode(struct net_device *dev)
{
	struct vnet_port *port = netdev_priv(dev);

	return sunvnet_set_rx_mode_common(dev, port->vp);
}

int ldmvsw_open(struct net_device *dev)
{
	struct vnet_port *port = netdev_priv(dev);
	struct vio_driver_state *vio = &port->vio;

	/* reset the channel */
	vio_link_state_change(vio, LDC_EVENT_RESET);
	vnet_port_reset(port);
	vio_port_up(vio);

	return 0;
}
EXPORT_SYMBOL_GPL(ldmvsw_open);

#ifdef CONFIG_NET_POLL_CONTROLLER
static void vsw_poll_controller(struct net_device *dev)
{
	struct vnet_port *port = netdev_priv(dev);

	return sunvnet_poll_controller_common(dev, port->vp);
}
#endif

static const struct net_device_ops vsw_ops = {
	.ndo_open		= ldmvsw_open,
	.ndo_stop		= sunvnet_close_common,
	.ndo_set_rx_mode	= vsw_set_rx_mode,
	.ndo_set_mac_address	= sunvnet_set_mac_addr_common,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_tx_timeout		= sunvnet_tx_timeout_common,
	.ndo_start_xmit		= vsw_start_xmit,
	.ndo_select_queue	= vsw_select_queue,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller    = vsw_poll_controller,
#endif
};

static const char *local_mac_prop = "local-mac-address";
static const char *cfg_handle_prop = "cfg-handle";

static struct vnet *vsw_get_vnet(struct mdesc_handle *hp,
				 u64 port_node,
				 u64 *handle)
{
	struct vnet *vp;
	struct vnet *iter;
	const u64 *local_mac = NULL;
	const u64 *cfghandle = NULL;
	u64 a;

	/* Get the parent virtual-network-switch macaddr and cfghandle */
	mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
		u64 target = mdesc_arc_target(hp, a);
		const char *name;

		name = mdesc_get_property(hp, target, "name", NULL);
		if (!name || strcmp(name, "virtual-network-switch"))
			continue;

		local_mac = mdesc_get_property(hp, target,
					       local_mac_prop, NULL);
		cfghandle = mdesc_get_property(hp, target,
					       cfg_handle_prop, NULL);
		break;
	}
	if (!local_mac || !cfghandle)
		return ERR_PTR(-ENODEV);

	/* find or create associated vnet */
	vp = NULL;
	mutex_lock(&vnet_list_mutex);
	list_for_each_entry(iter, &vnet_list, list) {
		if (iter->local_mac == *local_mac) {
			vp = iter;
			break;
		}
	}

	if (!vp) {
		vp = kzalloc(sizeof(*vp), GFP_KERNEL);
		if (unlikely(!vp)) {
			mutex_unlock(&vnet_list_mutex);
			return ERR_PTR(-ENOMEM);
		}

		spin_lock_init(&vp->lock);
		INIT_LIST_HEAD(&vp->port_list);
		INIT_LIST_HEAD(&vp->list);
		vp->local_mac = *local_mac;
		list_add(&vp->list, &vnet_list);
	}

	mutex_unlock(&vnet_list_mutex);

	*handle = (u64)*cfghandle;

	return vp;
}

static struct net_device *vsw_alloc_netdev(u8 hwaddr[],
					   struct vio_dev *vdev,
					   u64 handle,
					   u64 port_id)
{
	struct net_device *dev;
	struct vnet_port *port;
	int i;

	dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1);
	if (!dev)
		return ERR_PTR(-ENOMEM);
	dev->needed_headroom = VNET_PACKET_SKIP + 8;
	dev->needed_tailroom = 8;

	for (i = 0; i < ETH_ALEN; i++) {
		dev->dev_addr[i] = hwaddr[i];
		dev->perm_addr[i] = dev->dev_addr[i];
	}

	sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id);

	dev->netdev_ops = &vsw_ops;
	dev->ethtool_ops = &vsw_ethtool_ops;
	dev->watchdog_timeo = VSW_TX_TIMEOUT;

	dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG;
	dev->features = dev->hw_features;

	/* MTU range: 68 - 65535 */
	dev->min_mtu = ETH_MIN_MTU;
	dev->max_mtu = VNET_MAX_MTU;

	SET_NETDEV_DEV(dev, &vdev->dev);

	return dev;
}

static struct ldc_channel_config vsw_ldc_cfg = {
	.event		= sunvnet_event_common,
	.mtu		= 64,
	.mode		= LDC_MODE_UNRELIABLE,
};

static struct vio_driver_ops vsw_vio_ops = {
	.send_attr		= sunvnet_send_attr_common,
	.handle_attr		= sunvnet_handle_attr_common,
	.handshake_complete	= sunvnet_handshake_complete_common,
};

static const char *remote_macaddr_prop = "remote-mac-address";
static const char *id_prop = "id";

static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
{
	struct mdesc_handle *hp;
	struct vnet_port *port;
	unsigned long flags;
	struct vnet *vp;
	struct net_device *dev;
	const u64 *rmac;
	int len, i, err;
	const u64 *port_id;
	u64 handle;

	hp = mdesc_grab();

	rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
	err = -ENODEV;
	if (!rmac) {
		pr_err("Port lacks %s property\n", remote_macaddr_prop);
		mdesc_release(hp);
		return err;
	}

	port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL);
	err = -ENODEV;
	if (!port_id) {
		pr_err("Port lacks %s property\n", id_prop);
		mdesc_release(hp);
		return err;
	}

	/* Get (or create) the vnet associated with this port */
	vp = vsw_get_vnet(hp, vdev->mp, &handle);
	if (unlikely(IS_ERR(vp))) {
		err = PTR_ERR(vp);
		pr_err("Failed to get vnet for vsw-port\n");
		mdesc_release(hp);
		return err;
	}

	mdesc_release(hp);

	dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id);
	if (IS_ERR(dev)) {
		err = PTR_ERR(dev);
		pr_err("Failed to alloc netdev for vsw-port\n");
		return err;
	}

	port = netdev_priv(dev);

	INIT_LIST_HEAD(&port->list);

	for (i = 0; i < ETH_ALEN; i++)
		port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;

	port->vp = vp;
	port->dev = dev;
	port->switch_port = 1;
	port->tso = false; /* no tso in vsw, misbehaves in bridge */
	port->tsolen = 0;

	/* Mark the port as belonging to ldmvsw which directs the
	 * the common code to use the net_device in the vnet_port
	 * rather than the net_device in the vnet (which is used
	 * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE
	 * macro.
	 */
	port->vsw = 1;

	err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
			      vsw_versions, ARRAY_SIZE(vsw_versions),
			      &vsw_vio_ops, dev->name);
	if (err)
		goto err_out_free_dev;

	err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port);
	if (err)
		goto err_out_free_dev;

	dev_set_drvdata(&vdev->dev, port);

	netif_napi_add(dev, &port->napi, sunvnet_poll_common,
		       NAPI_POLL_WEIGHT);

	spin_lock_irqsave(&vp->lock, flags);
	list_add_rcu(&port->list, &vp->port_list);
	spin_unlock_irqrestore(&vp->lock, flags);

	setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common,
		    (unsigned long)port);

	err = register_netdev(dev);
	if (err) {
		pr_err("Cannot register net device, aborting\n");
		goto err_out_del_timer;
	}

	spin_lock_irqsave(&vp->lock, flags);
	sunvnet_port_add_txq_common(port);
	spin_unlock_irqrestore(&vp->lock, flags);

	napi_enable(&port->napi);
	vio_port_up(&port->vio);

	/* assure no carrier until we receive an LDC_EVENT_UP,
	 * even if the vsw config script tries to force us up
	 */
	netif_carrier_off(dev);

	netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr);

	pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name,
		port->raddr, " switch-port");

	return 0;

err_out_del_timer:
	del_timer_sync(&port->clean_timer);
	list_del_rcu(&port->list);
	synchronize_rcu();
	netif_napi_del(&port->napi);
	dev_set_drvdata(&vdev->dev, NULL);
	vio_ldc_free(&port->vio);

err_out_free_dev:
	free_netdev(dev);
	return err;
}

static int vsw_port_remove(struct vio_dev *vdev)
{
	struct vnet_port *port = dev_get_drvdata(&vdev->dev);
	unsigned long flags;

	if (port) {
		del_timer_sync(&port->vio.timer);
		del_timer_sync(&port->clean_timer);

		napi_disable(&port->napi);
		unregister_netdev(port->dev);

		list_del_rcu(&port->list);

		synchronize_rcu();
		spin_lock_irqsave(&port->vp->lock, flags);
		sunvnet_port_rm_txq_common(port);
		spin_unlock_irqrestore(&port->vp->lock, flags);
		netif_napi_del(&port->napi);
		sunvnet_port_free_tx_bufs_common(port);
		vio_ldc_free(&port->vio);

		dev_set_drvdata(&vdev->dev, NULL);

		free_netdev(port->dev);
	}

	return 0;
}

static void vsw_cleanup(void)
{
	struct vnet *vp;

	/* just need to free up the vnet list */
	mutex_lock(&vnet_list_mutex);
	while (!list_empty(&vnet_list)) {
		vp = list_first_entry(&vnet_list, struct vnet, list);
		list_del(&vp->list);
		/* vio_unregister_driver() should have cleaned up port_list */
		if (!list_empty(&vp->port_list))
			pr_err("Ports not removed by VIO subsystem!\n");
		kfree(vp);
	}
	mutex_unlock(&vnet_list_mutex);
}

static const struct vio_device_id vsw_port_match[] = {
	{
		.type = "vsw-port",
	},
	{},
};
MODULE_DEVICE_TABLE(vio, vsw_port_match);

static struct vio_driver vsw_port_driver = {
	.id_table	= vsw_port_match,
	.probe		= vsw_port_probe,
	.remove		= vsw_port_remove,
	.name		= "vsw_port",
};

static int __init vsw_init(void)
{
	pr_info("%s\n", version);
	return vio_register_driver(&vsw_port_driver);
}

static void __exit vsw_exit(void)
{
	vio_unregister_driver(&vsw_port_driver);
	vsw_cleanup();
}

module_init(vsw_init);
module_exit(vsw_exit);