aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/intel/fm10k/fm10k_ptp.c
blob: d966044e017af043fdc24770d4d642700949102b (plain) (blame)
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
/* Intel Ethernet Switch Host Interface Driver
 * Copyright(c) 2013 - 2014 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * The full GNU General Public License is included in this distribution in
 * the file called "COPYING".
 *
 * Contact Information:
 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 */

#include <linux/ptp_classify.h>
#include <linux/ptp_clock_kernel.h>

#include "fm10k.h"

#define FM10K_TS_TX_TIMEOUT		(HZ * 15)

void fm10k_systime_to_hwtstamp(struct fm10k_intfc *interface,
			       struct skb_shared_hwtstamps *hwtstamp,
			       u64 systime)
{
	unsigned long flags;

	read_lock_irqsave(&interface->systime_lock, flags);
	systime += interface->ptp_adjust;
	read_unlock_irqrestore(&interface->systime_lock, flags);

	hwtstamp->hwtstamp = ns_to_ktime(systime);
}

static struct sk_buff *fm10k_ts_tx_skb(struct fm10k_intfc *interface,
				       __le16 dglort)
{
	struct sk_buff_head *list = &interface->ts_tx_skb_queue;
	struct sk_buff *skb;

	skb_queue_walk(list, skb) {
		if (FM10K_CB(skb)->fi.w.dglort == dglort)
			return skb;
	}

	return NULL;
}

void fm10k_ts_tx_enqueue(struct fm10k_intfc *interface, struct sk_buff *skb)
{
	struct sk_buff_head *list = &interface->ts_tx_skb_queue;
	struct sk_buff *clone;
	unsigned long flags;

	/* create clone for us to return on the Tx path */
	clone = skb_clone_sk(skb);
	if (!clone)
		return;

	FM10K_CB(clone)->ts_tx_timeout = jiffies + FM10K_TS_TX_TIMEOUT;
	spin_lock_irqsave(&list->lock, flags);

	/* attempt to locate any buffers with the same dglort,
	 * if none are present then insert skb in tail of list
	 */
	skb = fm10k_ts_tx_skb(interface, FM10K_CB(clone)->fi.w.dglort);
	if (!skb)
		__skb_queue_tail(list, clone);

	spin_unlock_irqrestore(&list->lock, flags);

	/* if list is already has one then we just free the clone */
	if (skb)
		kfree_skb(skb);
	else
		skb_shinfo(clone)->tx_flags |= SKBTX_IN_PROGRESS;
}

void fm10k_ts_tx_hwtstamp(struct fm10k_intfc *interface, __le16 dglort,
			  u64 systime)
{
	struct skb_shared_hwtstamps shhwtstamps;
	struct sk_buff_head *list = &interface->ts_tx_skb_queue;
	struct sk_buff *skb;
	unsigned long flags;

	spin_lock_irqsave(&list->lock, flags);

	/* attempt to locate and pull the sk_buff out of the list */
	skb = fm10k_ts_tx_skb(interface, dglort);
	if (skb)
		__skb_unlink(skb, list);

	spin_unlock_irqrestore(&list->lock, flags);

	/* if not found do nothing */
	if (!skb)
		return;

	/* timestamp the sk_buff and return it to the socket */
	fm10k_systime_to_hwtstamp(interface, &shhwtstamps, systime);
	skb_complete_tx_timestamp(skb, &shhwtstamps);
}

void fm10k_ts_tx_subtask(struct fm10k_intfc *interface)
{
	struct sk_buff_head *list = &interface->ts_tx_skb_queue;
	struct sk_buff *skb, *tmp;
	unsigned long flags;

	/* If we're down or resetting, just bail */
	if (test_bit(__FM10K_DOWN, &interface->state) ||
	    test_bit(__FM10K_RESETTING, &interface->state))
		return;

	spin_lock_irqsave(&list->lock, flags);

	/* walk though the list and flush any expired timestamp packets */
	skb_queue_walk_safe(list, skb, tmp) {
		if (!time_is_after_jiffies(FM10K_CB(skb)->ts_tx_timeout))
			continue;
		__skb_unlink(skb, list);
		kfree_skb(skb);
		interface->tx_hwtstamp_timeouts++;
	}

	spin_unlock_irqrestore(&list->lock, flags);
}

static u64 fm10k_systime_read(struct fm10k_intfc *interface)
{
	struct fm10k_hw *hw = &interface->hw;

	return hw->mac.ops.read_systime(hw);
}

void fm10k_ts_reset(struct fm10k_intfc *interface)
{
	s64 ns = ktime_to_ns(ktime_get_real());
	unsigned long flags;

	/* reinitialize the clock */
	write_lock_irqsave(&interface->systime_lock, flags);
	interface->ptp_adjust = fm10k_systime_read(interface) - ns;
	write_unlock_irqrestore(&interface->systime_lock, flags);
}

void fm10k_ts_init(struct fm10k_intfc *interface)
{
	/* Initialize lock protecting systime access */
	rwlock_init(&interface->systime_lock);

	/* Initialize skb queue for pending timestamp requests */
	skb_queue_head_init(&interface->ts_tx_skb_queue);

	/* reset the clock to current kernel time */
	fm10k_ts_reset(interface);
}

/**
 * fm10k_get_ts_config - get current hardware timestamping configuration
 * @netdev: network interface device structure
 * @ifreq: ioctl data
 *
 * This function returns the current timestamping settings. Rather than
 * attempt to deconstruct registers to fill in the values, simply keep a copy
 * of the old settings around, and return a copy when requested.
 */
int fm10k_get_ts_config(struct net_device *netdev, struct ifreq *ifr)
{
	struct fm10k_intfc *interface = netdev_priv(netdev);
	struct hwtstamp_config *config = &interface->ts_config;

	return copy_to_user(ifr->ifr_data, config, sizeof(*config)) ?
		-EFAULT : 0;
}

/**
 * fm10k_set_ts_config - control hardware time stamping
 * @netdev: network interface device structure
 * @ifreq: ioctl data
 *
 * Outgoing time stamping can be enabled and disabled. Play nice and
 * disable it when requested, although it shouldn't cause any overhead
 * when no packet needs it. At most one packet in the queue may be
 * marked for time stamping, otherwise it would be impossible to tell
 * for sure to which packet the hardware time stamp belongs.
 *
 * Incoming time stamping has to be configured via the hardware
 * filters. Not all combinations are supported, in particular event
 * type has to be specified. Matching the kind of event packet is
 * not supported, with the exception of "all V2 events regardless of
 * level 2 or 4".
 *
 * Since hardware always timestamps Path delay packets when timestamping V2
 * packets, regardless of the type specified in the register, only use V2
 * Event mode. This more accurately tells the user what the hardware is going
 * to do anyways.
 */
int fm10k_set_ts_config(struct net_device *netdev, struct ifreq *ifr)
{
	struct fm10k_intfc *interface = netdev_priv(netdev);
	struct hwtstamp_config ts_config;

	if (copy_from_user(&ts_config, ifr->ifr_data, sizeof(ts_config)))
		return -EFAULT;

	/* reserved for future extensions */
	if (ts_config.flags)
		return -EINVAL;

	switch (ts_config.tx_type) {
	case HWTSTAMP_TX_OFF:
		break;
	case HWTSTAMP_TX_ON:
		/* we likely need some check here to see if this is supported */
		break;
	default:
		return -ERANGE;
	}

	switch (ts_config.rx_filter) {
	case HWTSTAMP_FILTER_NONE:
		interface->flags &= ~FM10K_FLAG_RX_TS_ENABLED;
		break;
	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
	case HWTSTAMP_FILTER_ALL:
		interface->flags |= FM10K_FLAG_RX_TS_ENABLED;
		ts_config.rx_filter = HWTSTAMP_FILTER_ALL;
		break;
	default:
		return -ERANGE;
	}

	/* save these settings for future reference */
	interface->ts_config = ts_config;

	return copy_to_user(ifr->ifr_data, &ts_config, sizeof(ts_config)) ?
		-EFAULT : 0;
}

static int fm10k_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
{
	struct fm10k_intfc *interface;
	struct fm10k_hw *hw;
	int err;

	interface = container_of(ptp, struct fm10k_intfc, ptp_caps);
	hw = &interface->hw;

	err = hw->mac.ops.adjust_systime(hw, ppb);

	/* the only error we should see is if the value is out of range */
	return (err == FM10K_ERR_PARAM) ? -ERANGE : err;
}

static int fm10k_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
	struct fm10k_intfc *interface;
	unsigned long flags;

	interface = container_of(ptp, struct fm10k_intfc, ptp_caps);

	write_lock_irqsave(&interface->systime_lock, flags);
	interface->ptp_adjust += delta;
	write_unlock_irqrestore(&interface->systime_lock, flags);

	return 0;
}

static int fm10k_ptp_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
{
	struct fm10k_intfc *interface;
	unsigned long flags;
	u64 now;

	interface = container_of(ptp, struct fm10k_intfc, ptp_caps);

	read_lock_irqsave(&interface->systime_lock, flags);
	now = fm10k_systime_read(interface) + interface->ptp_adjust;
	read_unlock_irqrestore(&interface->systime_lock, flags);

	*ts = ns_to_timespec(now);

	return 0;
}

static int fm10k_ptp_settime(struct ptp_clock_info *ptp,
			     const struct timespec *ts)
{
	struct fm10k_intfc *interface;
	unsigned long flags;
	u64 ns = timespec_to_ns(ts);

	interface = container_of(ptp, struct fm10k_intfc, ptp_caps);

	write_lock_irqsave(&interface->systime_lock, flags);
	interface->ptp_adjust = fm10k_systime_read(interface) - ns;
	write_unlock_irqrestore(&interface->systime_lock, flags);

	return 0;
}

static int fm10k_ptp_enable(struct ptp_clock_info *ptp,
			    struct ptp_clock_request *rq, int on)
{
	struct ptp_clock_time *t = &rq->perout.period;
	struct fm10k_intfc *interface;
	struct fm10k_hw *hw;
	u64 period;
	u32 step;

	/* we can only support periodic output */
	if (rq->type != PTP_CLK_REQ_PEROUT)
		return -EINVAL;

	/* verify the requested channel is there */
	if (rq->perout.index >= ptp->n_per_out)
		return -EINVAL;

	/* we cannot enforce start time as there is no
	 * mechanism for that in the hardware, we can only control
	 * the period.
	 */

	/* we cannot support periods greater than 4 seconds due to reg limit */
	if (t->sec > 4 || t->sec < 0)
		return -ERANGE;

	interface = container_of(ptp, struct fm10k_intfc, ptp_caps);
	hw = &interface->hw;

	/* we simply cannot support the operation if we don't have BAR4 */
	if (!hw->sw_addr)
		return -ENOTSUPP;

	/* convert to unsigned 64b ns, verify we can put it in a 32b register */
	period = t->sec * 1000000000LL + t->nsec;

	/* determine the minimum size for period */
	step = 2 * (fm10k_read_reg(hw, FM10K_SYSTIME_CFG) &
		    FM10K_SYSTIME_CFG_STEP_MASK);

	/* verify the value is in range supported by hardware */
	if ((period && (period < step)) || (period > U32_MAX))
		return -ERANGE;

	/* notify hardware of request to being sending pulses */
	fm10k_write_sw_reg(hw, FM10K_SW_SYSTIME_PULSE(rq->perout.index),
			   (u32)period);

	return 0;
}

static struct ptp_pin_desc fm10k_ptp_pd[2] = {
	{
		.name = "IEEE1588_PULSE0",
		.index = 0,
		.func = PTP_PF_PEROUT,
		.chan = 0
	},
	{
		.name = "IEEE1588_PULSE1",
		.index = 1,
		.func = PTP_PF_PEROUT,
		.chan = 1
	}
};

static int fm10k_ptp_verify(struct ptp_clock_info *ptp, unsigned int pin,
			    enum ptp_pin_function func, unsigned int chan)
{
	/* verify the requested pin is there */
	if (pin >= ptp->n_pins || !ptp->pin_config)
		return -EINVAL;

	/* enforce locked channels, no changing them */
	if (chan != ptp->pin_config[pin].chan)
		return -EINVAL;

	/* we want to keep the functions locked as well */
	if (func != ptp->pin_config[pin].func)
		return -EINVAL;

	return 0;
}

void fm10k_ptp_register(struct fm10k_intfc *interface)
{
	struct ptp_clock_info *ptp_caps = &interface->ptp_caps;
	struct device *dev = &interface->pdev->dev;
	struct ptp_clock *ptp_clock;

	snprintf(ptp_caps->name, sizeof(ptp_caps->name),
		 "%s", interface->netdev->name);
	ptp_caps->owner		= THIS_MODULE;
	/* This math is simply the inverse of the math in
	 * fm10k_adjust_systime_pf applied to an adjustment value
	 * of 2^30 - 1 which is the maximum value of the register:
	 * 	max_ppb == ((2^30 - 1) * 5^9) / 2^31
	 */
	ptp_caps->max_adj	= 976562;
	ptp_caps->adjfreq	= fm10k_ptp_adjfreq;
	ptp_caps->adjtime	= fm10k_ptp_adjtime;
	ptp_caps->gettime	= fm10k_ptp_gettime;
	ptp_caps->settime	= fm10k_ptp_settime;

	/* provide pins if BAR4 is accessible */
	if (interface->sw_addr) {
		/* enable periodic outputs */
		ptp_caps->n_per_out = 2;
		ptp_caps->enable	= fm10k_ptp_enable;

		/* enable clock pins */
		ptp_caps->verify	= fm10k_ptp_verify;
		ptp_caps->n_pins = 2;
		ptp_caps->pin_config = fm10k_ptp_pd;
	}

	ptp_clock = ptp_clock_register(ptp_caps, dev);
	if (IS_ERR(ptp_clock)) {
		ptp_clock = NULL;
		dev_err(dev, "ptp_clock_register failed\n");
	} else {
		dev_info(dev, "registered PHC device %s\n", ptp_caps->name);
	}

	interface->ptp_clock = ptp_clock;
}

void fm10k_ptp_unregister(struct fm10k_intfc *interface)
{
	struct ptp_clock *ptp_clock = interface->ptp_clock;
	struct device *dev = &interface->pdev->dev;

	if (!ptp_clock)
		return;

	interface->ptp_clock = NULL;

	ptp_clock_unregister(ptp_clock);
	dev_info(dev, "removed PHC %s\n", interface->ptp_caps.name);
}