summaryrefslogtreecommitdiffstats
path: root/drivers/net/failsafe/failsafe_private.h
blob: 886af8616fb036238aa118c5c8a0a47f2c51c6d3 (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
483
484
485
486
/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright 2017 6WIND S.A.
 * Copyright 2017 Mellanox Technologies, Ltd
 */

#ifndef _RTE_ETH_FAILSAFE_PRIVATE_H_
#define _RTE_ETH_FAILSAFE_PRIVATE_H_

#include <sys/queue.h>
#include <pthread.h>

#include <rte_atomic.h>
#include <rte_dev.h>
#include <rte_ethdev_driver.h>
#include <rte_devargs.h>
#include <rte_interrupts.h>

#define FAILSAFE_DRIVER_NAME "Fail-safe PMD"
#define FAILSAFE_OWNER_NAME "Fail-safe"

#define PMD_FAILSAFE_MAC_KVARG "mac"
#define PMD_FAILSAFE_HOTPLUG_POLL_KVARG "hotplug_poll"
#define PMD_FAILSAFE_PARAM_STRING	\
	"dev(<ifc>),"			\
	"exec(<shell command>),"	\
	"fd(<fd number>),"		\
	"mac=mac_addr,"			\
	"hotplug_poll=u64"		\
	""

#define FAILSAFE_HOTPLUG_DEFAULT_TIMEOUT_MS 2000

#define FAILSAFE_MAX_ETHPORTS 2
#define FAILSAFE_MAX_ETHADDR 128

#define DEVARGS_MAXLEN 4096

enum rxp_service_state {
	SS_NO_SERVICE = 0,
	SS_REGISTERED,
	SS_READY,
	SS_RUNNING,
};

/* TYPES */

struct rx_proxy {
	/* epoll file descriptor */
	int efd;
	/* event vector to be used by epoll */
	struct rte_epoll_event *evec;
	/* rte service id */
	uint32_t sid;
	/* service core id */
	uint32_t scid;
	enum rxp_service_state sstate;
};

struct rxq {
	struct fs_priv *priv;
	uint16_t qid;
	/* next sub_device to poll */
	struct sub_device *sdev;
	unsigned int socket_id;
	int event_fd;
	unsigned int enable_events:1;
	struct rte_eth_rxq_info info;
	rte_atomic64_t refcnt[];
};

struct txq {
	struct fs_priv *priv;
	uint16_t qid;
	unsigned int socket_id;
	struct rte_eth_txq_info info;
	rte_atomic64_t refcnt[];
};

struct rte_flow {
	TAILQ_ENTRY(rte_flow) next;
	/* sub_flows */
	struct rte_flow *flows[FAILSAFE_MAX_ETHPORTS];
	/* flow description for synchronization */
	struct rte_flow_desc *fd;
};

enum dev_state {
	DEV_UNDEFINED,
	DEV_PARSED,
	DEV_PROBED,
	DEV_ACTIVE,
	DEV_STARTED,
};

struct fs_stats {
	struct rte_eth_stats stats;
	uint64_t timestamp;
};

struct sub_device {
	/* Exhaustive DPDK device description */
	struct sub_device *next;
	struct rte_devargs devargs;
	struct rte_bus *bus;
	struct rte_device *dev;
	struct rte_eth_dev *edev;
	uint8_t sid;
	/* Device state machine */
	enum dev_state state;
	/* Last stats snapshot passed to user */
	struct fs_stats stats_snapshot;
	/* Some device are defined as a command line */
	char *cmdline;
	/* Others are retrieved through a file descriptor */
	char *fd_str;
	/* fail-safe device backreference */
	struct rte_eth_dev *fs_dev;
	/* flag calling for recollection */
	volatile unsigned int remove:1;
	/* flow isolation state */
	int flow_isolated:1;
	/* RMV callback registration state */
	unsigned int rmv_callback:1;
	/* LSC callback registration state */
	unsigned int lsc_callback:1;
};

struct fs_priv {
	struct rte_eth_dev *dev;
	/*
	 * Set of sub_devices.
	 * subs[0] is the preferred device
	 * any other is just another slave
	 */
	struct sub_device *subs;
	uint8_t subs_head; /* if head == tail, no subs */
	uint8_t subs_tail; /* first invalid */
	uint8_t subs_tx; /* current emitting device */
	uint8_t current_probed;
	/* flow mapping */
	TAILQ_HEAD(sub_flows, rte_flow) flow_list;
	/* current number of mac_addr slots allocated. */
	uint32_t nb_mac_addr;
	struct ether_addr mac_addrs[FAILSAFE_MAX_ETHADDR];
	uint32_t mac_addr_pool[FAILSAFE_MAX_ETHADDR];
	/* current capabilities */
	struct rte_eth_dev_info infos;
	struct rte_eth_dev_owner my_owner; /* Unique owner. */
	struct rte_intr_handle intr_handle; /* Port interrupt handle. */
	/*
	 * Fail-safe state machine.
	 * This level will be tracking state of the EAL and eth
	 * layer at large as defined by the user application.
	 * It will then steer the sub_devices toward the same
	 * synchronized state.
	 */
	enum dev_state state;
	struct rte_eth_stats stats_accumulator;
	/*
	 * Rx interrupts/events proxy.
	 * The PMD issues Rx events to the EAL on behalf of its subdevices,
	 * it does that by registering an event-fd for each of its queues with
	 * the EAL. A PMD service thread listens to all the Rx events from the
	 * subdevices, when an Rx event is issued by a subdevice it will be
	 * caught by this service with will trigger an Rx event in the
	 * appropriate failsafe Rx queue.
	 */
	struct rx_proxy rxp;
	pthread_mutex_t hotplug_mutex;
	/* Hot-plug mutex is locked by the alarm mechanism. */
	volatile unsigned int alarm_lock:1;
	unsigned int pending_alarm:1; /* An alarm is pending */
	/* flow isolation state */
	int flow_isolated:1;
};

/* FAILSAFE_INTR */

int failsafe_rx_intr_install(struct rte_eth_dev *dev);
void failsafe_rx_intr_uninstall(struct rte_eth_dev *dev);
int failsafe_rx_intr_install_subdevice(struct sub_device *sdev);
void failsafe_rx_intr_uninstall_subdevice(struct sub_device *sdev);

/* MISC */

int failsafe_hotplug_alarm_install(struct rte_eth_dev *dev);
int failsafe_hotplug_alarm_cancel(struct rte_eth_dev *dev);

/* RX / TX */

void set_burst_fn(struct rte_eth_dev *dev, int force_safe);

uint16_t failsafe_rx_burst(void *rxq,
		struct rte_mbuf **rx_pkts, uint16_t nb_pkts);
uint16_t failsafe_tx_burst(void *txq,
		struct rte_mbuf **tx_pkts, uint16_t nb_pkts);

uint16_t failsafe_rx_burst_fast(void *rxq,
		struct rte_mbuf **rx_pkts, uint16_t nb_pkts);
uint16_t failsafe_tx_burst_fast(void *txq,
		struct rte_mbuf **tx_pkts, uint16_t nb_pkts);

/* ARGS */

int failsafe_args_parse(struct rte_eth_dev *dev, const char *params);
void failsafe_args_free(struct rte_eth_dev *dev);
int failsafe_args_count_subdevice(struct rte_eth_dev *dev, const char *params);
int failsafe_args_parse_subs(struct rte_eth_dev *dev);

/* EAL */

int failsafe_eal_init(struct rte_eth_dev *dev);
int failsafe_eal_uninit(struct rte_eth_dev *dev);

/* ETH_DEV */

int failsafe_eth_dev_state_sync(struct rte_eth_dev *dev);
void failsafe_eth_dev_unregister_callbacks(struct sub_device *sdev);
void failsafe_dev_remove(struct rte_eth_dev *dev);
void failsafe_stats_increment(struct rte_eth_stats *to,
				struct rte_eth_stats *from);
int failsafe_eth_rmv_event_callback(uint16_t port_id,
				    enum rte_eth_event_type type,
				    void *arg, void *out);
int failsafe_eth_lsc_event_callback(uint16_t port_id,
				    enum rte_eth_event_type event,
				    void *cb_arg, void *out);
int failsafe_eth_new_event_callback(uint16_t port_id,
				    enum rte_eth_event_type event,
				    void *cb_arg, void *out);

/* GLOBALS */

extern const char pmd_failsafe_driver_name[];
extern const struct eth_dev_ops failsafe_ops;
extern const struct rte_flow_ops fs_flow_ops;
extern uint64_t hotplug_poll;
extern int mac_from_arg;

/* HELPERS */

/* dev: (struct rte_eth_dev *) fail-safe device */
#define PRIV(dev) \
	((struct fs_priv *)(dev)->data->dev_private)

/* sdev: (struct sub_device *) */
#define ETH(sdev) \
	((sdev)->edev)

/* sdev: (struct sub_device *) */
#define PORT_ID(sdev) \
	(ETH(sdev)->data->port_id)

/* sdev: (struct sub_device *) */
#define SUB_ID(sdev) \
	((sdev)->sid)

/**
 * Stateful iterator construct over fail-safe sub-devices:
 * s:     (struct sub_device *), iterator
 * i:     (uint8_t), increment
 * dev:   (struct rte_eth_dev *), fail-safe ethdev
 * state: (enum dev_state), minimum acceptable device state
 */
#define FOREACH_SUBDEV_STATE(s, i, dev, state)		\
	for (s = fs_find_next((dev), 0, state, &i);	\
	     s != NULL;					\
	     s = fs_find_next((dev), i + 1, state, &i))

/**
 * Iterator construct over fail-safe sub-devices:
 * s:   (struct sub_device *), iterator
 * i:   (uint8_t), increment
 * dev: (struct rte_eth_dev *), fail-safe ethdev
 */
#define FOREACH_SUBDEV(s, i, dev)			\
	FOREACH_SUBDEV_STATE(s, i, dev, DEV_UNDEFINED)

/* dev: (struct rte_eth_dev *) fail-safe device */
#define PREFERRED_SUBDEV(dev) \
	(&PRIV(dev)->subs[0])

/* dev: (struct rte_eth_dev *) fail-safe device */
#define TX_SUBDEV(dev)							  \
	(PRIV(dev)->subs_tx >= PRIV(dev)->subs_tail		   ? NULL \
	 : (PRIV(dev)->subs[PRIV(dev)->subs_tx].state < DEV_PROBED ? NULL \
	 : &PRIV(dev)->subs[PRIV(dev)->subs_tx]))

/**
 * s:   (struct sub_device *)
 * ops: (struct eth_dev_ops) member
 */
#define SUBOPS(s, ops) \
	(ETH(s)->dev_ops->ops)

/**
 * Atomic guard
 */

/**
 * a: (rte_atomic64_t)
 */
#define FS_ATOMIC_P(a) \
	rte_atomic64_set(&(a), 1)

/**
 * a: (rte_atomic64_t)
 */
#define FS_ATOMIC_V(a) \
	rte_atomic64_set(&(a), 0)

/**
 * s: (struct sub_device *)
 * i: uint16_t qid
 */
#define FS_ATOMIC_RX(s, i) \
	rte_atomic64_read( \
	 &((struct rxq *)((s)->fs_dev->data->rx_queues[i]))->refcnt[(s)->sid] \
	)
/**
 * s: (struct sub_device *)
 * i: uint16_t qid
 */
#define FS_ATOMIC_TX(s, i) \
	rte_atomic64_read( \
	 &((struct txq *)((s)->fs_dev->data->tx_queues[i]))->refcnt[(s)->sid] \
	)

#ifdef RTE_EXEC_ENV_BSDAPP
#define FS_THREADID_TYPE void*
#define FS_THREADID_FMT  "p"
#else
#define FS_THREADID_TYPE unsigned long
#define FS_THREADID_FMT  "lu"
#endif

extern int failsafe_logtype;

#define LOG__(l, m, ...) \
	rte_log(RTE_LOG_ ## l, failsafe_logtype, \
		"net_failsafe: " m "%c", __VA_ARGS__)

#define LOG_(level, ...) LOG__(level, __VA_ARGS__, '\n')
#define DEBUG(...) LOG_(DEBUG, __VA_ARGS__)
#define INFO(...) LOG_(INFO, __VA_ARGS__)
#define WARN(...) LOG_(WARNING, __VA_ARGS__)
#define ERROR(...) LOG_(ERR, __VA_ARGS__)

/* inlined functions */

static inline struct sub_device *
fs_find_next(struct rte_eth_dev *dev,
	     uint8_t sid,
	     enum dev_state min_state,
	     uint8_t *sid_out)
{
	struct sub_device *subs;
	uint8_t tail;

	subs = PRIV(dev)->subs;
	tail = PRIV(dev)->subs_tail;
	while (sid < tail) {
		if (subs[sid].state >= min_state)
			break;
		sid++;
	}
	*sid_out = sid;
	if (sid >= tail)
		return NULL;
	return &subs[sid];
}

/*
 * Lock hot-plug mutex.
 * is_alarm means that the caller is, for sure, the hot-plug alarm mechanism.
 */
static inline int
fs_lock(struct rte_eth_dev *dev, unsigned int is_alarm)
{
	int ret;

	if (is_alarm) {
		ret = pthread_mutex_trylock(&PRIV(dev)->hotplug_mutex);
		if (ret) {
			DEBUG("Hot-plug mutex lock trying failed(%s), will try"
			      " again later...", strerror(ret));
			return ret;
		}
		PRIV(dev)->alarm_lock = 1;
	} else {
		ret = pthread_mutex_lock(&PRIV(dev)->hotplug_mutex);
		if (ret) {
			ERROR("Cannot lock mutex(%s)", strerror(ret));
			return ret;
		}
	}
	DEBUG("Hot-plug mutex was locked by thread %" FS_THREADID_FMT "%s",
	      (FS_THREADID_TYPE)pthread_self(),
	      PRIV(dev)->alarm_lock ? " by the hot-plug alarm" : "");
	return ret;
}

/*
 * Unlock hot-plug mutex.
 * is_alarm means that the caller is, for sure, the hot-plug alarm mechanism.
 */
static inline void
fs_unlock(struct rte_eth_dev *dev, unsigned int is_alarm)
{
	int ret;
	unsigned int prev_alarm_lock = PRIV(dev)->alarm_lock;

	if (is_alarm) {
		RTE_ASSERT(PRIV(dev)->alarm_lock == 1);
		PRIV(dev)->alarm_lock = 0;
	}
	ret = pthread_mutex_unlock(&PRIV(dev)->hotplug_mutex);
	if (ret)
		ERROR("Cannot unlock hot-plug mutex(%s)", strerror(ret));
	else
		DEBUG("Hot-plug mutex was unlocked by thread %" FS_THREADID_FMT "%s",
		      (FS_THREADID_TYPE)pthread_self(),
		      prev_alarm_lock ? " by the hot-plug alarm" : "");
}

/*
 * Switch emitting device.
 * If banned is set, banned must not be considered for
 * the role of emitting device.
 */
static inline void
fs_switch_dev(struct rte_eth_dev *dev,
	      struct sub_device *banned)
{
	struct sub_device *txd;
	enum dev_state req_state;

	req_state = PRIV(dev)->state;
	txd = TX_SUBDEV(dev);
	if (PREFERRED_SUBDEV(dev)->state >= req_state &&
	    PREFERRED_SUBDEV(dev) != banned) {
		if (txd != PREFERRED_SUBDEV(dev) &&
		    (txd == NULL ||
		     (req_state == DEV_STARTED) ||
		     (txd && txd->state < DEV_STARTED))) {
			DEBUG("Switching tx_dev to preferred sub_device");
			PRIV(dev)->subs_tx = 0;
		}
	} else if ((txd && txd->state < req_state) ||
		   txd == NULL ||
		   txd == banned) {
		struct sub_device *sdev = NULL;
		uint8_t i;

		/* Using acceptable device */
		FOREACH_SUBDEV_STATE(sdev, i, dev, req_state) {
			if (sdev == banned)
				continue;
			DEBUG("Switching tx_dev to sub_device %d",
			      i);
			PRIV(dev)->subs_tx = i;
			break;
		}
		if (i >= PRIV(dev)->subs_tail || sdev == NULL) {
			DEBUG("No device ready, deactivating tx_dev");
			PRIV(dev)->subs_tx = PRIV(dev)->subs_tail;
		}
	} else {
		return;
	}
	set_burst_fn(dev, 0);
	rte_wmb();
}

/*
 * Adjust error value and rte_errno to the fail-safe actual error value.
 */
static inline int
fs_err(struct sub_device *sdev, int err)
{
	/* A device removal shouldn't be reported as an error. */
	if (sdev->remove == 1 || err == -EIO)
		return rte_errno = 0;
	return err;
}
#endif /* _RTE_ETH_FAILSAFE_PRIVATE_H_ */