summaryrefslogtreecommitdiffstats
path: root/drivers/net/ipa/ipa_modem.c
blob: 55c9329a4b1db62112bdbff6b3f841e567f4cfbc (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
// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2014-2018, The Linux Foundation. All rights reserved.
 * Copyright (C) 2018-2020 Linaro Ltd.
 */

#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/if_rmnet.h>
#include <linux/remoteproc/qcom_q6v5_ipa_notify.h>

#include "ipa.h"
#include "ipa_data.h"
#include "ipa_endpoint.h"
#include "ipa_table.h"
#include "ipa_mem.h"
#include "ipa_modem.h"
#include "ipa_smp2p.h"
#include "ipa_qmi.h"

#define IPA_NETDEV_NAME		"rmnet_ipa%d"
#define IPA_NETDEV_TAILROOM	0	/* for padding by mux layer */
#define IPA_NETDEV_TIMEOUT	10	/* seconds */

enum ipa_modem_state {
	IPA_MODEM_STATE_STOPPED	= 0,
	IPA_MODEM_STATE_STARTING,
	IPA_MODEM_STATE_RUNNING,
	IPA_MODEM_STATE_STOPPING,
};

/** struct ipa_priv - IPA network device private data */
struct ipa_priv {
	struct ipa *ipa;
};

/** ipa_open() - Opens the modem network interface */
static int ipa_open(struct net_device *netdev)
{
	struct ipa_priv *priv = netdev_priv(netdev);
	struct ipa *ipa = priv->ipa;
	int ret;

	ret = ipa_endpoint_enable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
	if (ret)
		return ret;
	ret = ipa_endpoint_enable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);
	if (ret)
		goto err_disable_tx;

	netif_start_queue(netdev);

	return 0;

err_disable_tx:
	ipa_endpoint_disable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);

	return ret;
}

/** ipa_stop() - Stops the modem network interface. */
static int ipa_stop(struct net_device *netdev)
{
	struct ipa_priv *priv = netdev_priv(netdev);
	struct ipa *ipa = priv->ipa;

	netif_stop_queue(netdev);

	ipa_endpoint_disable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);
	ipa_endpoint_disable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);

	return 0;
}

/** ipa_start_xmit() - Transmits an skb.
 * @skb: skb to be transmitted
 * @dev: network device
 *
 * Return codes:
 * NETDEV_TX_OK: Success
 * NETDEV_TX_BUSY: Error while transmitting the skb. Try again later
 */
static int ipa_start_xmit(struct sk_buff *skb, struct net_device *netdev)
{
	struct net_device_stats *stats = &netdev->stats;
	struct ipa_priv *priv = netdev_priv(netdev);
	struct ipa_endpoint *endpoint;
	struct ipa *ipa = priv->ipa;
	u32 skb_len = skb->len;
	int ret;

	if (!skb_len)
		goto err_drop_skb;

	endpoint = ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX];
	if (endpoint->data->qmap && skb->protocol != htons(ETH_P_MAP))
		goto err_drop_skb;

	ret = ipa_endpoint_skb_tx(endpoint, skb);
	if (ret) {
		if (ret != -E2BIG)
			return NETDEV_TX_BUSY;
		goto err_drop_skb;
	}

	stats->tx_packets++;
	stats->tx_bytes += skb_len;

	return NETDEV_TX_OK;

err_drop_skb:
	dev_kfree_skb_any(skb);
	stats->tx_dropped++;

	return NETDEV_TX_OK;
}

void ipa_modem_skb_rx(struct net_device *netdev, struct sk_buff *skb)
{
	struct net_device_stats *stats = &netdev->stats;

	if (skb) {
		skb->dev = netdev;
		skb->protocol = htons(ETH_P_MAP);
		stats->rx_packets++;
		stats->rx_bytes += skb->len;

		(void)netif_receive_skb(skb);
	} else {
		stats->rx_dropped++;
	}
}

static const struct net_device_ops ipa_modem_ops = {
	.ndo_open	= ipa_open,
	.ndo_stop	= ipa_stop,
	.ndo_start_xmit	= ipa_start_xmit,
};

/** ipa_modem_netdev_setup() - netdev setup function for the modem */
static void ipa_modem_netdev_setup(struct net_device *netdev)
{
	netdev->netdev_ops = &ipa_modem_ops;
	ether_setup(netdev);
	/* No header ops (override value set by ether_setup()) */
	netdev->header_ops = NULL;
	netdev->type = ARPHRD_RAWIP;
	netdev->hard_header_len = 0;
	netdev->max_mtu = IPA_MTU;
	netdev->mtu = netdev->max_mtu;
	netdev->addr_len = 0;
	netdev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);
	/* The endpoint is configured for QMAP */
	netdev->needed_headroom = sizeof(struct rmnet_map_header);
	netdev->needed_tailroom = IPA_NETDEV_TAILROOM;
	netdev->watchdog_timeo = IPA_NETDEV_TIMEOUT * HZ;
	netdev->hw_features = NETIF_F_SG;
}

/** ipa_modem_suspend() - suspend callback
 * @netdev:	Network device
 *
 * Suspend the modem's endpoints.
 */
void ipa_modem_suspend(struct net_device *netdev)
{
	struct ipa_priv *priv = netdev_priv(netdev);
	struct ipa *ipa = priv->ipa;

	netif_stop_queue(netdev);

	ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);
	ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
}

/** ipa_modem_resume() - resume callback for runtime_pm
 * @dev: pointer to device
 *
 * Resume the modem's endpoints.
 */
void ipa_modem_resume(struct net_device *netdev)
{
	struct ipa_priv *priv = netdev_priv(netdev);
	struct ipa *ipa = priv->ipa;

	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);

	netif_wake_queue(netdev);
}

int ipa_modem_start(struct ipa *ipa)
{
	enum ipa_modem_state state;
	struct net_device *netdev;
	struct ipa_priv *priv;
	int ret;

	/* Only attempt to start the modem if it's stopped */
	state = atomic_cmpxchg(&ipa->modem_state, IPA_MODEM_STATE_STOPPED,
			       IPA_MODEM_STATE_STARTING);

	/* Silently ignore attempts when running, or when changing state */
	if (state != IPA_MODEM_STATE_STOPPED)
		return 0;

	netdev = alloc_netdev(sizeof(struct ipa_priv), IPA_NETDEV_NAME,
			      NET_NAME_UNKNOWN, ipa_modem_netdev_setup);
	if (!netdev) {
		ret = -ENOMEM;
		goto out_set_state;
	}

	ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]->netdev = netdev;
	ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]->netdev = netdev;

	priv = netdev_priv(netdev);
	priv->ipa = ipa;

	ret = register_netdev(netdev);
	if (ret)
		free_netdev(netdev);
	else
		ipa->modem_netdev = netdev;

out_set_state:
	if (ret)
		atomic_set(&ipa->modem_state, IPA_MODEM_STATE_STOPPED);
	else
		atomic_set(&ipa->modem_state, IPA_MODEM_STATE_RUNNING);
	smp_mb__after_atomic();

	return ret;
}

int ipa_modem_stop(struct ipa *ipa)
{
	struct net_device *netdev = ipa->modem_netdev;
	enum ipa_modem_state state;
	int ret;

	/* Only attempt to stop the modem if it's running */
	state = atomic_cmpxchg(&ipa->modem_state, IPA_MODEM_STATE_RUNNING,
			       IPA_MODEM_STATE_STOPPING);

	/* Silently ignore attempts when already stopped */
	if (state == IPA_MODEM_STATE_STOPPED)
		return 0;

	/* If we're somewhere between stopped and starting, we're busy */
	if (state != IPA_MODEM_STATE_RUNNING)
		return -EBUSY;

	/* Prevent the modem from triggering a call to ipa_setup() */
	ipa_smp2p_disable(ipa);

	if (netdev) {
		/* Stop the queue and disable the endpoints if it's open */
		ret = ipa_stop(netdev);
		if (ret)
			goto out_set_state;

		ipa->modem_netdev = NULL;
		unregister_netdev(netdev);
		free_netdev(netdev);
	} else {
		ret = 0;
	}

out_set_state:
	if (ret)
		atomic_set(&ipa->modem_state, IPA_MODEM_STATE_RUNNING);
	else
		atomic_set(&ipa->modem_state, IPA_MODEM_STATE_STOPPED);
	smp_mb__after_atomic();

	return ret;
}

/* Treat a "clean" modem stop the same as a crash */
static void ipa_modem_crashed(struct ipa *ipa)
{
	struct device *dev = &ipa->pdev->dev;
	int ret;

	ipa_endpoint_modem_pause_all(ipa, true);

	ipa_endpoint_modem_hol_block_clear_all(ipa);

	ipa_table_reset(ipa, true);

	ret = ipa_table_hash_flush(ipa);
	if (ret)
		dev_err(dev, "error %d flushing hash caches\n", ret);

	ret = ipa_endpoint_modem_exception_reset_all(ipa);
	if (ret)
		dev_err(dev, "error %d resetting exception endpoint",
			ret);

	ipa_endpoint_modem_pause_all(ipa, false);

	ret = ipa_modem_stop(ipa);
	if (ret)
		dev_err(dev, "error %d stopping modem", ret);

	/* Now prepare for the next modem boot */
	ret = ipa_mem_zero_modem(ipa);
	if (ret)
		dev_err(dev, "error %d zeroing modem memory regions\n", ret);
}

static void ipa_modem_notify(void *data, enum qcom_rproc_event event)
{
	struct ipa *ipa = data;
	struct device *dev;

	dev = &ipa->pdev->dev;
	switch (event) {
	case MODEM_STARTING:
		dev_info(dev, "received modem starting event\n");
		ipa_smp2p_notify_reset(ipa);
		break;

	case MODEM_RUNNING:
		dev_info(dev, "received modem running event\n");
		break;

	case MODEM_STOPPING:
	case MODEM_CRASHED:
		dev_info(dev, "received modem %s event\n",
			 event == MODEM_STOPPING ? "stopping"
						 : "crashed");
		if (ipa->setup_complete)
			ipa_modem_crashed(ipa);
		break;

	case MODEM_OFFLINE:
		dev_info(dev, "received modem offline event\n");
		break;

	case MODEM_REMOVING:
		dev_info(dev, "received modem stopping event\n");
		break;

	default:
		dev_err(&ipa->pdev->dev, "unrecognized event %u\n", event);
		break;
	}
}

int ipa_modem_init(struct ipa *ipa, bool modem_init)
{
	return ipa_smp2p_init(ipa, modem_init);
}

void ipa_modem_exit(struct ipa *ipa)
{
	ipa_smp2p_exit(ipa);
}

int ipa_modem_config(struct ipa *ipa)
{
	return qcom_register_ipa_notify(ipa->modem_rproc, ipa_modem_notify,
					ipa);
}

void ipa_modem_deconfig(struct ipa *ipa)
{
	qcom_deregister_ipa_notify(ipa->modem_rproc);
}

int ipa_modem_setup(struct ipa *ipa)
{
	return ipa_qmi_setup(ipa);
}

void ipa_modem_teardown(struct ipa *ipa)
{
	ipa_qmi_teardown(ipa);
}