summaryrefslogtreecommitdiffstats
path: root/net/core/selftests.c
blob: 8f801e6e3b91b4cbb2886a2f0a5b478d48ed6246 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2019 Synopsys, Inc. and/or its affiliates.
 * stmmac Selftests Support
 *
 * Author: Jose Abreu <joabreu@synopsys.com>
 *
 * Ported from stmmac by:
 * Copyright (C) 2021 Oleksij Rempel <o.rempel@pengutronix.de>
 */

#include <linux/phy.h>
#include <net/selftests.h>
#include <net/tcp.h>
#include <net/udp.h>

struct net_packet_attrs {
	const unsigned char *src;
	const unsigned char *dst;
	u32 ip_src;
	u32 ip_dst;
	bool tcp;
	u16 sport;
	u16 dport;
	int timeout;
	int size;
	int max_size;
	u8 id;
	u16 queue_mapping;
};

struct net_test_priv {
	struct net_packet_attrs *packet;
	struct packet_type pt;
	struct completion comp;
	int double_vlan;
	int vlan_id;
	int ok;
};

struct netsfhdr {
	__be32 version;
	__be64 magic;
	u8 id;
} __packed;

static u8 net_test_next_id;

#define NET_TEST_PKT_SIZE (sizeof(struct ethhdr) + sizeof(struct iphdr) + \
			   sizeof(struct netsfhdr))
#define NET_TEST_PKT_MAGIC	0xdeadcafecafedeadULL
#define NET_LB_TIMEOUT		msecs_to_jiffies(200)

static struct sk_buff *net_test_get_skb(struct net_device *ndev,
					struct net_packet_attrs *attr)
{
	struct sk_buff *skb = NULL;
	struct udphdr *uhdr = NULL;
	struct tcphdr *thdr = NULL;
	struct netsfhdr *shdr;
	struct ethhdr *ehdr;
	struct iphdr *ihdr;
	int iplen, size;

	size = attr->size + NET_TEST_PKT_SIZE;

	if (attr->tcp)
		size += sizeof(struct tcphdr);
	else
		size += sizeof(struct udphdr);

	if (attr->max_size && attr->max_size > size)
		size = attr->max_size;

	skb = netdev_alloc_skb(ndev, size);
	if (!skb)
		return NULL;

	prefetchw(skb->data);

	ehdr = skb_push(skb, ETH_HLEN);
	skb_reset_mac_header(skb);

	skb_set_network_header(skb, skb->len);
	ihdr = skb_put(skb, sizeof(*ihdr));

	skb_set_transport_header(skb, skb->len);
	if (attr->tcp)
		thdr = skb_put(skb, sizeof(*thdr));
	else
		uhdr = skb_put(skb, sizeof(*uhdr));

	eth_zero_addr(ehdr->h_dest);

	if (attr->src)
		ether_addr_copy(ehdr->h_source, attr->src);
	if (attr->dst)
		ether_addr_copy(ehdr->h_dest, attr->dst);

	ehdr->h_proto = htons(ETH_P_IP);

	if (attr->tcp) {
		thdr->source = htons(attr->sport);
		thdr->dest = htons(attr->dport);
		thdr->doff = sizeof(struct tcphdr) / 4;
		thdr->check = 0;
	} else {
		uhdr->source = htons(attr->sport);
		uhdr->dest = htons(attr->dport);
		uhdr->len = htons(sizeof(*shdr) + sizeof(*uhdr) + attr->size);
		if (attr->max_size)
			uhdr->len = htons(attr->max_size -
					  (sizeof(*ihdr) + sizeof(*ehdr)));
		uhdr->check = 0;
	}

	ihdr->ihl = 5;
	ihdr->ttl = 32;
	ihdr->version = 4;
	if (attr->tcp)
		ihdr->protocol = IPPROTO_TCP;
	else
		ihdr->protocol = IPPROTO_UDP;
	iplen = sizeof(*ihdr) + sizeof(*shdr) + attr->size;
	if (attr->tcp)
		iplen += sizeof(*thdr);
	else
		iplen += sizeof(*uhdr);

	if (attr->max_size)
		iplen = attr->max_size - sizeof(*ehdr);

	ihdr->tot_len = htons(iplen);
	ihdr->frag_off = 0;
	ihdr->saddr = htonl(attr->ip_src);
	ihdr->daddr = htonl(attr->ip_dst);
	ihdr->tos = 0;
	ihdr->id = 0;
	ip_send_check(ihdr);

	shdr = skb_put(skb, sizeof(*shdr));
	shdr->version = 0;
	shdr->magic = cpu_to_be64(NET_TEST_PKT_MAGIC);
	attr->id = net_test_next_id;
	shdr->id = net_test_next_id++;

	if (attr->size)
		skb_put(skb, attr->size);
	if (attr->max_size && attr->max_size > skb->len)
		skb_put(skb, attr->max_size - skb->len);

	skb->csum = 0;
	skb->ip_summed = CHECKSUM_PARTIAL;
	if (attr->tcp) {
		thdr->check = ~tcp_v4_check(skb->len, ihdr->saddr,
					    ihdr->daddr, 0);
		skb->csum_start = skb_transport_header(skb) - skb->head;
		skb->csum_offset = offsetof(struct tcphdr, check);
	} else {
		udp4_hwcsum(skb, ihdr->saddr, ihdr->daddr);
	}

	skb->protocol = htons(ETH_P_IP);
	skb->pkt_type = PACKET_HOST;
	skb->dev = ndev;

	return skb;
}

static int net_test_loopback_validate(struct sk_buff *skb,
				      struct net_device *ndev,
				      struct packet_type *pt,
				      struct net_device *orig_ndev)
{
	struct net_test_priv *tpriv = pt->af_packet_priv;
	const unsigned char *src = tpriv->packet->src;
	const unsigned char *dst = tpriv->packet->dst;
	struct netsfhdr *shdr;
	struct ethhdr *ehdr;
	struct udphdr *uhdr;
	struct tcphdr *thdr;
	struct iphdr *ihdr;

	skb = skb_unshare(skb, GFP_ATOMIC);
	if (!skb)
		goto out;

	if (skb_linearize(skb))
		goto out;
	if (skb_headlen(skb) < (NET_TEST_PKT_SIZE - ETH_HLEN))
		goto out;

	ehdr = (struct ethhdr *)skb_mac_header(skb);
	if (dst) {
		if (!ether_addr_equal_unaligned(ehdr->h_dest, dst))
			goto out;
	}

	if (src) {
		if (!ether_addr_equal_unaligned(ehdr->h_source, src))
			goto out;
	}

	ihdr = ip_hdr(skb);
	if (tpriv->double_vlan)
		ihdr = (struct iphdr *)(skb_network_header(skb) + 4);

	if (tpriv->packet->tcp) {
		if (ihdr->protocol != IPPROTO_TCP)
			goto out;

		thdr = (struct tcphdr *)((u8 *)ihdr + 4 * ihdr->ihl);
		if (thdr->dest != htons(tpriv->packet->dport))
			goto out;

		shdr = (struct netsfhdr *)((u8 *)thdr + sizeof(*thdr));
	} else {
		if (ihdr->protocol != IPPROTO_UDP)
			goto out;

		uhdr = (struct udphdr *)((u8 *)ihdr + 4 * ihdr->ihl);
		if (uhdr->dest != htons(tpriv->packet->dport))
			goto out;

		shdr = (struct netsfhdr *)((u8 *)uhdr + sizeof(*uhdr));
	}

	if (shdr->magic != cpu_to_be64(NET_TEST_PKT_MAGIC))
		goto out;
	if (tpriv->packet->id != shdr->id)
		goto out;

	tpriv->ok = true;
	complete(&tpriv->comp);
out:
	kfree_skb(skb);
	return 0;
}

static int __net_test_loopback(struct net_device *ndev,
			       struct net_packet_attrs *attr)
{
	struct net_test_priv *tpriv;
	struct sk_buff *skb = NULL;
	int ret = 0;

	tpriv = kzalloc(sizeof(*tpriv), GFP_KERNEL);
	if (!tpriv)
		return -ENOMEM;

	tpriv->ok = false;
	init_completion(&tpriv->comp);

	tpriv->pt.type = htons(ETH_P_IP);
	tpriv->pt.func = net_test_loopback_validate;
	tpriv->pt.dev = ndev;
	tpriv->pt.af_packet_priv = tpriv;
	tpriv->packet = attr;
	dev_add_pack(&tpriv->pt);

	skb = net_test_get_skb(ndev, attr);
	if (!skb) {
		ret = -ENOMEM;
		goto cleanup;
	}

	ret = dev_direct_xmit(skb, attr->queue_mapping);
	if (ret < 0) {
		goto cleanup;
	} else if (ret > 0) {
		ret = -ENETUNREACH;
		goto cleanup;
	}

	if (!attr->timeout)
		attr->timeout = NET_LB_TIMEOUT;

	wait_for_completion_timeout(&tpriv->comp, attr->timeout);
	ret = tpriv->ok ? 0 : -ETIMEDOUT;

cleanup:
	dev_remove_pack(&tpriv->pt);
	kfree(tpriv);
	return ret;
}

static int net_test_netif_carrier(struct net_device *ndev)
{
	return netif_carrier_ok(ndev) ? 0 : -ENOLINK;
}

static int net_test_phy_phydev(struct net_device *ndev)
{
	return ndev->phydev ? 0 : -EOPNOTSUPP;
}

static int net_test_phy_loopback_enable(struct net_device *ndev)
{
	if (!ndev->phydev)
		return -EOPNOTSUPP;

	return phy_loopback(ndev->phydev, true);
}

static int net_test_phy_loopback_disable(struct net_device *ndev)
{
	if (!ndev->phydev)
		return -EOPNOTSUPP;

	return phy_loopback(ndev->phydev, false);
}

static int net_test_phy_loopback_udp(struct net_device *ndev)
{
	struct net_packet_attrs attr = { };

	attr.dst = ndev->dev_addr;
	return __net_test_loopback(ndev, &attr);
}

static int net_test_phy_loopback_udp_mtu(struct net_device *ndev)
{
	struct net_packet_attrs attr = { };

	attr.dst = ndev->dev_addr;
	attr.max_size = ndev->mtu;
	return __net_test_loopback(ndev, &attr);
}

static int net_test_phy_loopback_tcp(struct net_device *ndev)
{
	struct net_packet_attrs attr = { };

	attr.dst = ndev->dev_addr;
	attr.tcp = true;
	return __net_test_loopback(ndev, &attr);
}

static const struct net_test {
	char name[ETH_GSTRING_LEN];
	int (*fn)(struct net_device *ndev);
} net_selftests[] = {
	{
		.name = "Carrier                       ",
		.fn = net_test_netif_carrier,
	}, {
		.name = "PHY dev is present            ",
		.fn = net_test_phy_phydev,
	}, {
		/* This test should be done before all PHY loopback test */
		.name = "PHY internal loopback, enable ",
		.fn = net_test_phy_loopback_enable,
	}, {
		.name = "PHY internal loopback, UDP    ",
		.fn = net_test_phy_loopback_udp,
	}, {
		.name = "PHY internal loopback, MTU    ",
		.fn = net_test_phy_loopback_udp_mtu,
	}, {
		.name = "PHY internal loopback, TCP    ",
		.fn = net_test_phy_loopback_tcp,
	}, {
		/* This test should be done after all PHY loopback test */
		.name = "PHY internal loopback, disable",
		.fn = net_test_phy_loopback_disable,
	},
};

void net_selftest(struct net_device *ndev, struct ethtool_test *etest, u64 *buf)
{
	int count = net_selftest_get_count();
	int i;

	memset(buf, 0, sizeof(*buf) * count);
	net_test_next_id = 0;

	if (etest->flags != ETH_TEST_FL_OFFLINE) {
		netdev_err(ndev, "Only offline tests are supported\n");
		etest->flags |= ETH_TEST_FL_FAILED;
		return;
	}


	for (i = 0; i < count; i++) {
		buf[i] = net_selftests[i].fn(ndev);
		if (buf[i] && (buf[i] != -EOPNOTSUPP))
			etest->flags |= ETH_TEST_FL_FAILED;
	}
}
EXPORT_SYMBOL_GPL(net_selftest);

int net_selftest_get_count(void)
{
	return ARRAY_SIZE(net_selftests);
}
EXPORT_SYMBOL_GPL(net_selftest_get_count);

void net_selftest_get_strings(u8 *data)
{
	int i;

	for (i = 0; i < net_selftest_get_count(); i++)
		ethtool_sprintf(&data, "%2d. %s", i + 1,
				net_selftests[i].name);
}
EXPORT_SYMBOL_GPL(net_selftest_get_strings);

MODULE_DESCRIPTION("Common library for generic PHY ethtool selftests");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Oleksij Rempel <o.rempel@pengutronix.de>");