1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
3 */
4
5 #include <stdio.h>
6 #include <stdint.h>
7 #include <stdlib.h>
8 #include <pthread.h>
9 #include <sys/queue.h>
10 #include <stdarg.h>
11 #include <unistd.h>
12 #include <string.h>
13 #include <errno.h>
14 #include <inttypes.h>
15 #include <sys/epoll.h>
16 #include <sys/signalfd.h>
17 #include <sys/ioctl.h>
18 #include <sys/eventfd.h>
19 #include <assert.h>
20 #include <stdbool.h>
21
22 #include <rte_common.h>
23 #include <rte_interrupts.h>
24 #include <rte_memory.h>
25 #include <rte_launch.h>
26 #include <rte_eal.h>
27 #include <rte_per_lcore.h>
28 #include <rte_lcore.h>
29 #include <rte_branch_prediction.h>
30 #include <rte_debug.h>
31 #include <rte_log.h>
32 #include <rte_errno.h>
33 #include <rte_spinlock.h>
34 #include <rte_pause.h>
35 #include <rte_vfio.h>
36 #include <rte_eal_trace.h>
37
38 #include "eal_private.h"
39 #include "eal_vfio.h"
40 #include "eal_thread.h"
41
42 #define EAL_INTR_EPOLL_WAIT_FOREVER (-1)
43 #define NB_OTHER_INTR 1
44
45 static RTE_DEFINE_PER_LCORE(int, _epfd) = -1; /**< epoll fd per thread */
46
47 /**
48 * union for pipe fds.
49 */
50 union intr_pipefds{
51 struct {
52 int pipefd[2];
53 };
54 struct {
55 int readfd;
56 int writefd;
57 };
58 };
59
60 /**
61 * union buffer for reading on different devices
62 */
63 union rte_intr_read_buffer {
64 int uio_intr_count; /* for uio device */
65 #ifdef VFIO_PRESENT
66 uint64_t vfio_intr_count; /* for vfio device */
67 #endif
68 uint64_t timerfd_num; /* for timerfd */
69 char charbuf[16]; /* for others */
70 };
71
72 TAILQ_HEAD(rte_intr_cb_list, rte_intr_callback);
73 TAILQ_HEAD(rte_intr_source_list, rte_intr_source);
74
75 struct rte_intr_callback {
76 TAILQ_ENTRY(rte_intr_callback) next;
77 rte_intr_callback_fn cb_fn; /**< callback address */
78 void *cb_arg; /**< parameter for callback */
79 uint8_t pending_delete; /**< delete after callback is called */
80 rte_intr_unregister_callback_fn ucb_fn; /**< fn to call before cb is deleted */
81 };
82
83 struct rte_intr_source {
84 TAILQ_ENTRY(rte_intr_source) next;
85 struct rte_intr_handle intr_handle; /**< interrupt handle */
86 struct rte_intr_cb_list callbacks; /**< user callbacks */
87 uint32_t active;
88 };
89
90 /* global spinlock for interrupt data operation */
91 static rte_spinlock_t intr_lock = RTE_SPINLOCK_INITIALIZER;
92
93 /* union buffer for pipe read/write */
94 static union intr_pipefds intr_pipe;
95
96 /* interrupt sources list */
97 static struct rte_intr_source_list intr_sources;
98
99 /* interrupt handling thread */
100 static pthread_t intr_thread;
101
102 /* VFIO interrupts */
103 #ifdef VFIO_PRESENT
104
105 #define IRQ_SET_BUF_LEN (sizeof(struct vfio_irq_set) + sizeof(int))
106 /* irq set buffer length for queue interrupts and LSC interrupt */
107 #define MSIX_IRQ_SET_BUF_LEN (sizeof(struct vfio_irq_set) + \
108 sizeof(int) * (RTE_MAX_RXTX_INTR_VEC_ID + 1))
109
110 /* enable legacy (INTx) interrupts */
111 static int
vfio_enable_intx(const struct rte_intr_handle * intr_handle)112 vfio_enable_intx(const struct rte_intr_handle *intr_handle) {
113 struct vfio_irq_set *irq_set;
114 char irq_set_buf[IRQ_SET_BUF_LEN];
115 int len, ret;
116 int *fd_ptr;
117
118 len = sizeof(irq_set_buf);
119
120 /* enable INTx */
121 irq_set = (struct vfio_irq_set *) irq_set_buf;
122 irq_set->argsz = len;
123 irq_set->count = 1;
124 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
125 irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
126 irq_set->start = 0;
127 fd_ptr = (int *) &irq_set->data;
128 *fd_ptr = intr_handle->fd;
129
130 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
131
132 if (ret) {
133 RTE_LOG(ERR, EAL, "Error enabling INTx interrupts for fd %d\n",
134 intr_handle->fd);
135 return -1;
136 }
137
138 /* unmask INTx after enabling */
139 memset(irq_set, 0, len);
140 len = sizeof(struct vfio_irq_set);
141 irq_set->argsz = len;
142 irq_set->count = 1;
143 irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK;
144 irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
145 irq_set->start = 0;
146
147 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
148
149 if (ret) {
150 RTE_LOG(ERR, EAL, "Error unmasking INTx interrupts for fd %d\n",
151 intr_handle->fd);
152 return -1;
153 }
154 return 0;
155 }
156
157 /* disable legacy (INTx) interrupts */
158 static int
vfio_disable_intx(const struct rte_intr_handle * intr_handle)159 vfio_disable_intx(const struct rte_intr_handle *intr_handle) {
160 struct vfio_irq_set *irq_set;
161 char irq_set_buf[IRQ_SET_BUF_LEN];
162 int len, ret;
163
164 len = sizeof(struct vfio_irq_set);
165
166 /* mask interrupts before disabling */
167 irq_set = (struct vfio_irq_set *) irq_set_buf;
168 irq_set->argsz = len;
169 irq_set->count = 1;
170 irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK;
171 irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
172 irq_set->start = 0;
173
174 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
175
176 if (ret) {
177 RTE_LOG(ERR, EAL, "Error masking INTx interrupts for fd %d\n",
178 intr_handle->fd);
179 return -1;
180 }
181
182 /* disable INTx*/
183 memset(irq_set, 0, len);
184 irq_set->argsz = len;
185 irq_set->count = 0;
186 irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
187 irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
188 irq_set->start = 0;
189
190 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
191
192 if (ret) {
193 RTE_LOG(ERR, EAL,
194 "Error disabling INTx interrupts for fd %d\n", intr_handle->fd);
195 return -1;
196 }
197 return 0;
198 }
199
200 /* unmask/ack legacy (INTx) interrupts */
201 static int
vfio_ack_intx(const struct rte_intr_handle * intr_handle)202 vfio_ack_intx(const struct rte_intr_handle *intr_handle)
203 {
204 struct vfio_irq_set irq_set;
205
206 /* unmask INTx */
207 memset(&irq_set, 0, sizeof(irq_set));
208 irq_set.argsz = sizeof(irq_set);
209 irq_set.count = 1;
210 irq_set.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK;
211 irq_set.index = VFIO_PCI_INTX_IRQ_INDEX;
212 irq_set.start = 0;
213
214 if (ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, &irq_set)) {
215 RTE_LOG(ERR, EAL, "Error unmasking INTx interrupts for fd %d\n",
216 intr_handle->fd);
217 return -1;
218 }
219 return 0;
220 }
221
222 /* enable MSI interrupts */
223 static int
vfio_enable_msi(const struct rte_intr_handle * intr_handle)224 vfio_enable_msi(const struct rte_intr_handle *intr_handle) {
225 int len, ret;
226 char irq_set_buf[IRQ_SET_BUF_LEN];
227 struct vfio_irq_set *irq_set;
228 int *fd_ptr;
229
230 len = sizeof(irq_set_buf);
231
232 irq_set = (struct vfio_irq_set *) irq_set_buf;
233 irq_set->argsz = len;
234 irq_set->count = 1;
235 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
236 irq_set->index = VFIO_PCI_MSI_IRQ_INDEX;
237 irq_set->start = 0;
238 fd_ptr = (int *) &irq_set->data;
239 *fd_ptr = intr_handle->fd;
240
241 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
242
243 if (ret) {
244 RTE_LOG(ERR, EAL, "Error enabling MSI interrupts for fd %d\n",
245 intr_handle->fd);
246 return -1;
247 }
248 return 0;
249 }
250
251 /* disable MSI interrupts */
252 static int
vfio_disable_msi(const struct rte_intr_handle * intr_handle)253 vfio_disable_msi(const struct rte_intr_handle *intr_handle) {
254 struct vfio_irq_set *irq_set;
255 char irq_set_buf[IRQ_SET_BUF_LEN];
256 int len, ret;
257
258 len = sizeof(struct vfio_irq_set);
259
260 irq_set = (struct vfio_irq_set *) irq_set_buf;
261 irq_set->argsz = len;
262 irq_set->count = 0;
263 irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
264 irq_set->index = VFIO_PCI_MSI_IRQ_INDEX;
265 irq_set->start = 0;
266
267 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
268
269 if (ret)
270 RTE_LOG(ERR, EAL,
271 "Error disabling MSI interrupts for fd %d\n", intr_handle->fd);
272
273 return ret;
274 }
275
276 /* enable MSI-X interrupts */
277 static int
vfio_enable_msix(const struct rte_intr_handle * intr_handle)278 vfio_enable_msix(const struct rte_intr_handle *intr_handle) {
279 int len, ret;
280 char irq_set_buf[MSIX_IRQ_SET_BUF_LEN];
281 struct vfio_irq_set *irq_set;
282 int *fd_ptr;
283
284 len = sizeof(irq_set_buf);
285
286 irq_set = (struct vfio_irq_set *) irq_set_buf;
287 irq_set->argsz = len;
288 /* 0 < irq_set->count < RTE_MAX_RXTX_INTR_VEC_ID + 1 */
289 irq_set->count = intr_handle->max_intr ?
290 (intr_handle->max_intr > RTE_MAX_RXTX_INTR_VEC_ID + 1 ?
291 RTE_MAX_RXTX_INTR_VEC_ID + 1 : intr_handle->max_intr) : 1;
292 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
293 irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX;
294 irq_set->start = 0;
295 fd_ptr = (int *) &irq_set->data;
296 /* INTR vector offset 0 reserve for non-efds mapping */
297 fd_ptr[RTE_INTR_VEC_ZERO_OFFSET] = intr_handle->fd;
298 memcpy(&fd_ptr[RTE_INTR_VEC_RXTX_OFFSET], intr_handle->efds,
299 sizeof(*intr_handle->efds) * intr_handle->nb_efd);
300
301 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
302
303 if (ret) {
304 RTE_LOG(ERR, EAL, "Error enabling MSI-X interrupts for fd %d\n",
305 intr_handle->fd);
306 return -1;
307 }
308
309 return 0;
310 }
311
312 /* disable MSI-X interrupts */
313 static int
vfio_disable_msix(const struct rte_intr_handle * intr_handle)314 vfio_disable_msix(const struct rte_intr_handle *intr_handle) {
315 struct vfio_irq_set *irq_set;
316 char irq_set_buf[MSIX_IRQ_SET_BUF_LEN];
317 int len, ret;
318
319 len = sizeof(struct vfio_irq_set);
320
321 irq_set = (struct vfio_irq_set *) irq_set_buf;
322 irq_set->argsz = len;
323 irq_set->count = 0;
324 irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
325 irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX;
326 irq_set->start = 0;
327
328 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
329
330 if (ret)
331 RTE_LOG(ERR, EAL,
332 "Error disabling MSI-X interrupts for fd %d\n", intr_handle->fd);
333
334 return ret;
335 }
336
337 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
338 /* enable req notifier */
339 static int
vfio_enable_req(const struct rte_intr_handle * intr_handle)340 vfio_enable_req(const struct rte_intr_handle *intr_handle)
341 {
342 int len, ret;
343 char irq_set_buf[IRQ_SET_BUF_LEN];
344 struct vfio_irq_set *irq_set;
345 int *fd_ptr;
346
347 len = sizeof(irq_set_buf);
348
349 irq_set = (struct vfio_irq_set *) irq_set_buf;
350 irq_set->argsz = len;
351 irq_set->count = 1;
352 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
353 VFIO_IRQ_SET_ACTION_TRIGGER;
354 irq_set->index = VFIO_PCI_REQ_IRQ_INDEX;
355 irq_set->start = 0;
356 fd_ptr = (int *) &irq_set->data;
357 *fd_ptr = intr_handle->fd;
358
359 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
360
361 if (ret) {
362 RTE_LOG(ERR, EAL, "Error enabling req interrupts for fd %d\n",
363 intr_handle->fd);
364 return -1;
365 }
366
367 return 0;
368 }
369
370 /* disable req notifier */
371 static int
vfio_disable_req(const struct rte_intr_handle * intr_handle)372 vfio_disable_req(const struct rte_intr_handle *intr_handle)
373 {
374 struct vfio_irq_set *irq_set;
375 char irq_set_buf[IRQ_SET_BUF_LEN];
376 int len, ret;
377
378 len = sizeof(struct vfio_irq_set);
379
380 irq_set = (struct vfio_irq_set *) irq_set_buf;
381 irq_set->argsz = len;
382 irq_set->count = 0;
383 irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
384 irq_set->index = VFIO_PCI_REQ_IRQ_INDEX;
385 irq_set->start = 0;
386
387 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
388
389 if (ret)
390 RTE_LOG(ERR, EAL, "Error disabling req interrupts for fd %d\n",
391 intr_handle->fd);
392
393 return ret;
394 }
395 #endif
396 #endif
397
398 static int
uio_intx_intr_disable(const struct rte_intr_handle * intr_handle)399 uio_intx_intr_disable(const struct rte_intr_handle *intr_handle)
400 {
401 unsigned char command_high;
402
403 /* use UIO config file descriptor for uio_pci_generic */
404 if (pread(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
405 RTE_LOG(ERR, EAL,
406 "Error reading interrupts status for fd %d\n",
407 intr_handle->uio_cfg_fd);
408 return -1;
409 }
410 /* disable interrupts */
411 command_high |= 0x4;
412 if (pwrite(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
413 RTE_LOG(ERR, EAL,
414 "Error disabling interrupts for fd %d\n",
415 intr_handle->uio_cfg_fd);
416 return -1;
417 }
418
419 return 0;
420 }
421
422 static int
uio_intx_intr_enable(const struct rte_intr_handle * intr_handle)423 uio_intx_intr_enable(const struct rte_intr_handle *intr_handle)
424 {
425 unsigned char command_high;
426
427 /* use UIO config file descriptor for uio_pci_generic */
428 if (pread(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
429 RTE_LOG(ERR, EAL,
430 "Error reading interrupts status for fd %d\n",
431 intr_handle->uio_cfg_fd);
432 return -1;
433 }
434 /* enable interrupts */
435 command_high &= ~0x4;
436 if (pwrite(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
437 RTE_LOG(ERR, EAL,
438 "Error enabling interrupts for fd %d\n",
439 intr_handle->uio_cfg_fd);
440 return -1;
441 }
442
443 return 0;
444 }
445
446 static int
uio_intr_disable(const struct rte_intr_handle * intr_handle)447 uio_intr_disable(const struct rte_intr_handle *intr_handle)
448 {
449 const int value = 0;
450
451 if (write(intr_handle->fd, &value, sizeof(value)) < 0) {
452 RTE_LOG(ERR, EAL,
453 "Error disabling interrupts for fd %d (%s)\n",
454 intr_handle->fd, strerror(errno));
455 return -1;
456 }
457 return 0;
458 }
459
460 static int
uio_intr_enable(const struct rte_intr_handle * intr_handle)461 uio_intr_enable(const struct rte_intr_handle *intr_handle)
462 {
463 const int value = 1;
464
465 if (write(intr_handle->fd, &value, sizeof(value)) < 0) {
466 RTE_LOG(ERR, EAL,
467 "Error enabling interrupts for fd %d (%s)\n",
468 intr_handle->fd, strerror(errno));
469 return -1;
470 }
471 return 0;
472 }
473
474 int
rte_intr_callback_register(const struct rte_intr_handle * intr_handle,rte_intr_callback_fn cb,void * cb_arg)475 rte_intr_callback_register(const struct rte_intr_handle *intr_handle,
476 rte_intr_callback_fn cb, void *cb_arg)
477 {
478 int ret, wake_thread;
479 struct rte_intr_source *src;
480 struct rte_intr_callback *callback;
481
482 wake_thread = 0;
483
484 /* first do parameter checking */
485 if (intr_handle == NULL || intr_handle->fd < 0 || cb == NULL) {
486 RTE_LOG(ERR, EAL,
487 "Registering with invalid input parameter\n");
488 return -EINVAL;
489 }
490
491 /* allocate a new interrupt callback entity */
492 callback = calloc(1, sizeof(*callback));
493 if (callback == NULL) {
494 RTE_LOG(ERR, EAL, "Can not allocate memory\n");
495 return -ENOMEM;
496 }
497 callback->cb_fn = cb;
498 callback->cb_arg = cb_arg;
499 callback->pending_delete = 0;
500 callback->ucb_fn = NULL;
501
502 rte_spinlock_lock(&intr_lock);
503
504 /* check if there is at least one callback registered for the fd */
505 TAILQ_FOREACH(src, &intr_sources, next) {
506 if (src->intr_handle.fd == intr_handle->fd) {
507 /* we had no interrupts for this */
508 if (TAILQ_EMPTY(&src->callbacks))
509 wake_thread = 1;
510
511 TAILQ_INSERT_TAIL(&(src->callbacks), callback, next);
512 ret = 0;
513 break;
514 }
515 }
516
517 /* no existing callbacks for this - add new source */
518 if (src == NULL) {
519 src = calloc(1, sizeof(*src));
520 if (src == NULL) {
521 RTE_LOG(ERR, EAL, "Can not allocate memory\n");
522 free(callback);
523 ret = -ENOMEM;
524 } else {
525 src->intr_handle = *intr_handle;
526 TAILQ_INIT(&src->callbacks);
527 TAILQ_INSERT_TAIL(&(src->callbacks), callback, next);
528 TAILQ_INSERT_TAIL(&intr_sources, src, next);
529 wake_thread = 1;
530 ret = 0;
531 }
532 }
533
534 rte_spinlock_unlock(&intr_lock);
535
536 /**
537 * check if need to notify the pipe fd waited by epoll_wait to
538 * rebuild the wait list.
539 */
540 if (wake_thread)
541 if (write(intr_pipe.writefd, "1", 1) < 0)
542 ret = -EPIPE;
543
544 rte_eal_trace_intr_callback_register(intr_handle, cb, cb_arg, ret);
545 return ret;
546 }
547
548 int
rte_intr_callback_unregister_pending(const struct rte_intr_handle * intr_handle,rte_intr_callback_fn cb_fn,void * cb_arg,rte_intr_unregister_callback_fn ucb_fn)549 rte_intr_callback_unregister_pending(const struct rte_intr_handle *intr_handle,
550 rte_intr_callback_fn cb_fn, void *cb_arg,
551 rte_intr_unregister_callback_fn ucb_fn)
552 {
553 int ret;
554 struct rte_intr_source *src;
555 struct rte_intr_callback *cb, *next;
556
557 /* do parameter checking first */
558 if (intr_handle == NULL || intr_handle->fd < 0) {
559 RTE_LOG(ERR, EAL,
560 "Unregistering with invalid input parameter\n");
561 return -EINVAL;
562 }
563
564 rte_spinlock_lock(&intr_lock);
565
566 /* check if the insterrupt source for the fd is existent */
567 TAILQ_FOREACH(src, &intr_sources, next)
568 if (src->intr_handle.fd == intr_handle->fd)
569 break;
570
571 /* No interrupt source registered for the fd */
572 if (src == NULL) {
573 ret = -ENOENT;
574
575 /* only usable if the source is active */
576 } else if (src->active == 0) {
577 ret = -EAGAIN;
578
579 } else {
580 ret = 0;
581
582 /* walk through the callbacks and mark all that match. */
583 for (cb = TAILQ_FIRST(&src->callbacks); cb != NULL; cb = next) {
584 next = TAILQ_NEXT(cb, next);
585 if (cb->cb_fn == cb_fn && (cb_arg == (void *)-1 ||
586 cb->cb_arg == cb_arg)) {
587 cb->pending_delete = 1;
588 cb->ucb_fn = ucb_fn;
589 ret++;
590 }
591 }
592 }
593
594 rte_spinlock_unlock(&intr_lock);
595
596 return ret;
597 }
598
599 int
rte_intr_callback_unregister(const struct rte_intr_handle * intr_handle,rte_intr_callback_fn cb_fn,void * cb_arg)600 rte_intr_callback_unregister(const struct rte_intr_handle *intr_handle,
601 rte_intr_callback_fn cb_fn, void *cb_arg)
602 {
603 int ret;
604 struct rte_intr_source *src;
605 struct rte_intr_callback *cb, *next;
606
607 /* do parameter checking first */
608 if (intr_handle == NULL || intr_handle->fd < 0) {
609 RTE_LOG(ERR, EAL,
610 "Unregistering with invalid input parameter\n");
611 return -EINVAL;
612 }
613
614 rte_spinlock_lock(&intr_lock);
615
616 /* check if the insterrupt source for the fd is existent */
617 TAILQ_FOREACH(src, &intr_sources, next)
618 if (src->intr_handle.fd == intr_handle->fd)
619 break;
620
621 /* No interrupt source registered for the fd */
622 if (src == NULL) {
623 ret = -ENOENT;
624
625 /* interrupt source has some active callbacks right now. */
626 } else if (src->active != 0) {
627 ret = -EAGAIN;
628
629 /* ok to remove. */
630 } else {
631 ret = 0;
632
633 /*walk through the callbacks and remove all that match. */
634 for (cb = TAILQ_FIRST(&src->callbacks); cb != NULL; cb = next) {
635
636 next = TAILQ_NEXT(cb, next);
637
638 if (cb->cb_fn == cb_fn && (cb_arg == (void *)-1 ||
639 cb->cb_arg == cb_arg)) {
640 TAILQ_REMOVE(&src->callbacks, cb, next);
641 free(cb);
642 ret++;
643 }
644 }
645
646 /* all callbacks for that source are removed. */
647 if (TAILQ_EMPTY(&src->callbacks)) {
648 TAILQ_REMOVE(&intr_sources, src, next);
649 free(src);
650 }
651 }
652
653 rte_spinlock_unlock(&intr_lock);
654
655 /* notify the pipe fd waited by epoll_wait to rebuild the wait list */
656 if (ret >= 0 && write(intr_pipe.writefd, "1", 1) < 0) {
657 ret = -EPIPE;
658 }
659
660 rte_eal_trace_intr_callback_unregister(intr_handle, cb_fn, cb_arg,
661 ret);
662 return ret;
663 }
664
665 int
rte_intr_enable(const struct rte_intr_handle * intr_handle)666 rte_intr_enable(const struct rte_intr_handle *intr_handle)
667 {
668 int rc = 0;
669
670 if (intr_handle == NULL)
671 return -1;
672
673 if (intr_handle->type == RTE_INTR_HANDLE_VDEV) {
674 rc = 0;
675 goto out;
676 }
677
678 if (intr_handle->fd < 0 || intr_handle->uio_cfg_fd < 0) {
679 rc = -1;
680 goto out;
681 }
682
683 switch (intr_handle->type){
684 /* write to the uio fd to enable the interrupt */
685 case RTE_INTR_HANDLE_UIO:
686 if (uio_intr_enable(intr_handle))
687 rc = -1;
688 break;
689 case RTE_INTR_HANDLE_UIO_INTX:
690 if (uio_intx_intr_enable(intr_handle))
691 rc = -1;
692 break;
693 /* not used at this moment */
694 case RTE_INTR_HANDLE_ALARM:
695 rc = -1;
696 break;
697 #ifdef VFIO_PRESENT
698 case RTE_INTR_HANDLE_VFIO_MSIX:
699 if (vfio_enable_msix(intr_handle))
700 rc = -1;
701 break;
702 case RTE_INTR_HANDLE_VFIO_MSI:
703 if (vfio_enable_msi(intr_handle))
704 rc = -1;
705 break;
706 case RTE_INTR_HANDLE_VFIO_LEGACY:
707 if (vfio_enable_intx(intr_handle))
708 rc = -1;
709 break;
710 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
711 case RTE_INTR_HANDLE_VFIO_REQ:
712 if (vfio_enable_req(intr_handle))
713 rc = -1;
714 break;
715 #endif
716 #endif
717 /* not used at this moment */
718 case RTE_INTR_HANDLE_DEV_EVENT:
719 rc = -1;
720 break;
721 /* unknown handle type */
722 default:
723 RTE_LOG(ERR, EAL,
724 "Unknown handle type of fd %d\n",
725 intr_handle->fd);
726 rc = -1;
727 break;
728 }
729 out:
730 rte_eal_trace_intr_enable(intr_handle, rc);
731 return rc;
732 }
733
734 /**
735 * PMD generally calls this function at the end of its IRQ callback.
736 * Internally, it unmasks the interrupt if possible.
737 *
738 * For INTx, unmasking is required as the interrupt is auto-masked prior to
739 * invoking callback.
740 *
741 * For MSI/MSI-X, unmasking is typically not needed as the interrupt is not
742 * auto-masked. In fact, for interrupt handle types VFIO_MSIX and VFIO_MSI,
743 * this function is no-op.
744 */
745 int
rte_intr_ack(const struct rte_intr_handle * intr_handle)746 rte_intr_ack(const struct rte_intr_handle *intr_handle)
747 {
748 if (intr_handle && intr_handle->type == RTE_INTR_HANDLE_VDEV)
749 return 0;
750
751 if (!intr_handle || intr_handle->fd < 0 || intr_handle->uio_cfg_fd < 0)
752 return -1;
753
754 switch (intr_handle->type) {
755 /* Both acking and enabling are same for UIO */
756 case RTE_INTR_HANDLE_UIO:
757 if (uio_intr_enable(intr_handle))
758 return -1;
759 break;
760 case RTE_INTR_HANDLE_UIO_INTX:
761 if (uio_intx_intr_enable(intr_handle))
762 return -1;
763 break;
764 /* not used at this moment */
765 case RTE_INTR_HANDLE_ALARM:
766 return -1;
767 #ifdef VFIO_PRESENT
768 /* VFIO MSI* is implicitly acked unlike INTx, nothing to do */
769 case RTE_INTR_HANDLE_VFIO_MSIX:
770 case RTE_INTR_HANDLE_VFIO_MSI:
771 return 0;
772 case RTE_INTR_HANDLE_VFIO_LEGACY:
773 if (vfio_ack_intx(intr_handle))
774 return -1;
775 break;
776 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
777 case RTE_INTR_HANDLE_VFIO_REQ:
778 return -1;
779 #endif
780 #endif
781 /* not used at this moment */
782 case RTE_INTR_HANDLE_DEV_EVENT:
783 return -1;
784 /* unknown handle type */
785 default:
786 RTE_LOG(ERR, EAL, "Unknown handle type of fd %d\n",
787 intr_handle->fd);
788 return -1;
789 }
790
791 return 0;
792 }
793
794 int
rte_intr_disable(const struct rte_intr_handle * intr_handle)795 rte_intr_disable(const struct rte_intr_handle *intr_handle)
796 {
797 int rc = 0;
798
799 if (intr_handle == NULL)
800 return -1;
801
802 if (intr_handle->type == RTE_INTR_HANDLE_VDEV) {
803 rc = 0;
804 goto out;
805 }
806
807 if (intr_handle->fd < 0 || intr_handle->uio_cfg_fd < 0) {
808 rc = -1;
809 goto out;
810 }
811
812 switch (intr_handle->type){
813 /* write to the uio fd to disable the interrupt */
814 case RTE_INTR_HANDLE_UIO:
815 if (uio_intr_disable(intr_handle))
816 rc = -1;
817 break;
818 case RTE_INTR_HANDLE_UIO_INTX:
819 if (uio_intx_intr_disable(intr_handle))
820 rc = -1;
821 break;
822 /* not used at this moment */
823 case RTE_INTR_HANDLE_ALARM:
824 rc = -1;
825 break;
826 #ifdef VFIO_PRESENT
827 case RTE_INTR_HANDLE_VFIO_MSIX:
828 if (vfio_disable_msix(intr_handle))
829 rc = -1;
830 break;
831 case RTE_INTR_HANDLE_VFIO_MSI:
832 if (vfio_disable_msi(intr_handle))
833 rc = -1;
834 break;
835 case RTE_INTR_HANDLE_VFIO_LEGACY:
836 if (vfio_disable_intx(intr_handle))
837 rc = -1;
838 break;
839 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
840 case RTE_INTR_HANDLE_VFIO_REQ:
841 if (vfio_disable_req(intr_handle))
842 rc = -1;
843 break;
844 #endif
845 #endif
846 /* not used at this moment */
847 case RTE_INTR_HANDLE_DEV_EVENT:
848 rc = -1;
849 break;
850 /* unknown handle type */
851 default:
852 RTE_LOG(ERR, EAL,
853 "Unknown handle type of fd %d\n",
854 intr_handle->fd);
855 rc = -1;
856 break;
857 }
858 out:
859 rte_eal_trace_intr_disable(intr_handle, rc);
860 return rc;
861 }
862
863 static int
eal_intr_process_interrupts(struct epoll_event * events,int nfds)864 eal_intr_process_interrupts(struct epoll_event *events, int nfds)
865 {
866 bool call = false;
867 int n, bytes_read, rv;
868 struct rte_intr_source *src;
869 struct rte_intr_callback *cb, *next;
870 union rte_intr_read_buffer buf;
871 struct rte_intr_callback active_cb;
872
873 for (n = 0; n < nfds; n++) {
874
875 /**
876 * if the pipe fd is ready to read, return out to
877 * rebuild the wait list.
878 */
879 if (events[n].data.fd == intr_pipe.readfd){
880 int r = read(intr_pipe.readfd, buf.charbuf,
881 sizeof(buf.charbuf));
882 RTE_SET_USED(r);
883 return -1;
884 }
885 rte_spinlock_lock(&intr_lock);
886 TAILQ_FOREACH(src, &intr_sources, next)
887 if (src->intr_handle.fd ==
888 events[n].data.fd)
889 break;
890 if (src == NULL){
891 rte_spinlock_unlock(&intr_lock);
892 continue;
893 }
894
895 /* mark this interrupt source as active and release the lock. */
896 src->active = 1;
897 rte_spinlock_unlock(&intr_lock);
898
899 /* set the length to be read dor different handle type */
900 switch (src->intr_handle.type) {
901 case RTE_INTR_HANDLE_UIO:
902 case RTE_INTR_HANDLE_UIO_INTX:
903 bytes_read = sizeof(buf.uio_intr_count);
904 break;
905 case RTE_INTR_HANDLE_ALARM:
906 bytes_read = sizeof(buf.timerfd_num);
907 break;
908 #ifdef VFIO_PRESENT
909 case RTE_INTR_HANDLE_VFIO_MSIX:
910 case RTE_INTR_HANDLE_VFIO_MSI:
911 case RTE_INTR_HANDLE_VFIO_LEGACY:
912 bytes_read = sizeof(buf.vfio_intr_count);
913 break;
914 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
915 case RTE_INTR_HANDLE_VFIO_REQ:
916 bytes_read = 0;
917 call = true;
918 break;
919 #endif
920 #endif
921 case RTE_INTR_HANDLE_VDEV:
922 case RTE_INTR_HANDLE_EXT:
923 bytes_read = 0;
924 call = true;
925 break;
926 case RTE_INTR_HANDLE_DEV_EVENT:
927 bytes_read = 0;
928 call = true;
929 break;
930 default:
931 bytes_read = 1;
932 break;
933 }
934
935 if (bytes_read > 0) {
936 /**
937 * read out to clear the ready-to-be-read flag
938 * for epoll_wait.
939 */
940 bytes_read = read(events[n].data.fd, &buf, bytes_read);
941 if (bytes_read < 0) {
942 if (errno == EINTR || errno == EWOULDBLOCK)
943 continue;
944
945 RTE_LOG(ERR, EAL, "Error reading from file "
946 "descriptor %d: %s\n",
947 events[n].data.fd,
948 strerror(errno));
949 /*
950 * The device is unplugged or buggy, remove
951 * it as an interrupt source and return to
952 * force the wait list to be rebuilt.
953 */
954 rte_spinlock_lock(&intr_lock);
955 TAILQ_REMOVE(&intr_sources, src, next);
956 rte_spinlock_unlock(&intr_lock);
957
958 for (cb = TAILQ_FIRST(&src->callbacks); cb;
959 cb = next) {
960 next = TAILQ_NEXT(cb, next);
961 TAILQ_REMOVE(&src->callbacks, cb, next);
962 free(cb);
963 }
964 free(src);
965 return -1;
966 } else if (bytes_read == 0)
967 RTE_LOG(ERR, EAL, "Read nothing from file "
968 "descriptor %d\n", events[n].data.fd);
969 else
970 call = true;
971 }
972
973 /* grab a lock, again to call callbacks and update status. */
974 rte_spinlock_lock(&intr_lock);
975
976 if (call) {
977
978 /* Finally, call all callbacks. */
979 TAILQ_FOREACH(cb, &src->callbacks, next) {
980
981 /* make a copy and unlock. */
982 active_cb = *cb;
983 rte_spinlock_unlock(&intr_lock);
984
985 /* call the actual callback */
986 active_cb.cb_fn(active_cb.cb_arg);
987
988 /*get the lock back. */
989 rte_spinlock_lock(&intr_lock);
990 }
991 }
992 /* we done with that interrupt source, release it. */
993 src->active = 0;
994
995 rv = 0;
996
997 /* check if any callback are supposed to be removed */
998 for (cb = TAILQ_FIRST(&src->callbacks); cb != NULL; cb = next) {
999 next = TAILQ_NEXT(cb, next);
1000 if (cb->pending_delete) {
1001 TAILQ_REMOVE(&src->callbacks, cb, next);
1002 if (cb->ucb_fn)
1003 cb->ucb_fn(&src->intr_handle, cb->cb_arg);
1004 free(cb);
1005 rv++;
1006 }
1007 }
1008
1009 /* all callbacks for that source are removed. */
1010 if (TAILQ_EMPTY(&src->callbacks)) {
1011 TAILQ_REMOVE(&intr_sources, src, next);
1012 free(src);
1013 }
1014
1015 /* notify the pipe fd waited by epoll_wait to rebuild the wait list */
1016 if (rv > 0 && write(intr_pipe.writefd, "1", 1) < 0) {
1017 rte_spinlock_unlock(&intr_lock);
1018 return -EPIPE;
1019 }
1020
1021 rte_spinlock_unlock(&intr_lock);
1022 }
1023
1024 return 0;
1025 }
1026
1027 /**
1028 * It handles all the interrupts.
1029 *
1030 * @param pfd
1031 * epoll file descriptor.
1032 * @param totalfds
1033 * The number of file descriptors added in epoll.
1034 *
1035 * @return
1036 * void
1037 */
1038 static void
eal_intr_handle_interrupts(int pfd,unsigned totalfds)1039 eal_intr_handle_interrupts(int pfd, unsigned totalfds)
1040 {
1041 struct epoll_event events[totalfds];
1042 int nfds = 0;
1043
1044 for(;;) {
1045 nfds = epoll_wait(pfd, events, totalfds,
1046 EAL_INTR_EPOLL_WAIT_FOREVER);
1047 /* epoll_wait fail */
1048 if (nfds < 0) {
1049 if (errno == EINTR)
1050 continue;
1051 RTE_LOG(ERR, EAL,
1052 "epoll_wait returns with fail\n");
1053 return;
1054 }
1055 /* epoll_wait timeout, will never happens here */
1056 else if (nfds == 0)
1057 continue;
1058 /* epoll_wait has at least one fd ready to read */
1059 if (eal_intr_process_interrupts(events, nfds) < 0)
1060 return;
1061 }
1062 }
1063
1064 /**
1065 * It builds/rebuilds up the epoll file descriptor with all the
1066 * file descriptors being waited on. Then handles the interrupts.
1067 *
1068 * @param arg
1069 * pointer. (unused)
1070 *
1071 * @return
1072 * never return;
1073 */
1074 static __rte_noreturn void *
eal_intr_thread_main(__rte_unused void * arg)1075 eal_intr_thread_main(__rte_unused void *arg)
1076 {
1077 /* host thread, never break out */
1078 for (;;) {
1079 /* build up the epoll fd with all descriptors we are to
1080 * wait on then pass it to the handle_interrupts function
1081 */
1082 static struct epoll_event pipe_event = {
1083 .events = EPOLLIN | EPOLLPRI,
1084 };
1085 struct rte_intr_source *src;
1086 unsigned numfds = 0;
1087
1088 /* create epoll fd */
1089 int pfd = epoll_create(1);
1090 if (pfd < 0)
1091 rte_panic("Cannot create epoll instance\n");
1092
1093 pipe_event.data.fd = intr_pipe.readfd;
1094 /**
1095 * add pipe fd into wait list, this pipe is used to
1096 * rebuild the wait list.
1097 */
1098 if (epoll_ctl(pfd, EPOLL_CTL_ADD, intr_pipe.readfd,
1099 &pipe_event) < 0) {
1100 rte_panic("Error adding fd to %d epoll_ctl, %s\n",
1101 intr_pipe.readfd, strerror(errno));
1102 }
1103 numfds++;
1104
1105 rte_spinlock_lock(&intr_lock);
1106
1107 TAILQ_FOREACH(src, &intr_sources, next) {
1108 struct epoll_event ev;
1109
1110 if (src->callbacks.tqh_first == NULL)
1111 continue; /* skip those with no callbacks */
1112 memset(&ev, 0, sizeof(ev));
1113 ev.events = EPOLLIN | EPOLLPRI | EPOLLRDHUP | EPOLLHUP;
1114 ev.data.fd = src->intr_handle.fd;
1115
1116 /**
1117 * add all the uio device file descriptor
1118 * into wait list.
1119 */
1120 if (epoll_ctl(pfd, EPOLL_CTL_ADD,
1121 src->intr_handle.fd, &ev) < 0){
1122 rte_panic("Error adding fd %d epoll_ctl, %s\n",
1123 src->intr_handle.fd, strerror(errno));
1124 }
1125 else
1126 numfds++;
1127 }
1128 rte_spinlock_unlock(&intr_lock);
1129 /* serve the interrupt */
1130 eal_intr_handle_interrupts(pfd, numfds);
1131
1132 /**
1133 * when we return, we need to rebuild the
1134 * list of fds to monitor.
1135 */
1136 close(pfd);
1137 }
1138 }
1139
1140 int
rte_eal_intr_init(void)1141 rte_eal_intr_init(void)
1142 {
1143 int ret = 0;
1144
1145 /* init the global interrupt source head */
1146 TAILQ_INIT(&intr_sources);
1147
1148 /**
1149 * create a pipe which will be waited by epoll and notified to
1150 * rebuild the wait list of epoll.
1151 */
1152 if (pipe(intr_pipe.pipefd) < 0) {
1153 rte_errno = errno;
1154 return -1;
1155 }
1156
1157 /* create the host thread to wait/handle the interrupt */
1158 ret = rte_ctrl_thread_create(&intr_thread, "eal-intr-thread", NULL,
1159 eal_intr_thread_main, NULL);
1160 if (ret != 0) {
1161 rte_errno = -ret;
1162 RTE_LOG(ERR, EAL,
1163 "Failed to create thread for interrupt handling\n");
1164 }
1165
1166 return ret;
1167 }
1168
1169 static void
eal_intr_proc_rxtx_intr(int fd,const struct rte_intr_handle * intr_handle)1170 eal_intr_proc_rxtx_intr(int fd, const struct rte_intr_handle *intr_handle)
1171 {
1172 union rte_intr_read_buffer buf;
1173 int bytes_read = 0;
1174 int nbytes;
1175
1176 switch (intr_handle->type) {
1177 case RTE_INTR_HANDLE_UIO:
1178 case RTE_INTR_HANDLE_UIO_INTX:
1179 bytes_read = sizeof(buf.uio_intr_count);
1180 break;
1181 #ifdef VFIO_PRESENT
1182 case RTE_INTR_HANDLE_VFIO_MSIX:
1183 case RTE_INTR_HANDLE_VFIO_MSI:
1184 case RTE_INTR_HANDLE_VFIO_LEGACY:
1185 bytes_read = sizeof(buf.vfio_intr_count);
1186 break;
1187 #endif
1188 case RTE_INTR_HANDLE_VDEV:
1189 bytes_read = intr_handle->efd_counter_size;
1190 /* For vdev, number of bytes to read is set by driver */
1191 break;
1192 case RTE_INTR_HANDLE_EXT:
1193 return;
1194 default:
1195 bytes_read = 1;
1196 RTE_LOG(INFO, EAL, "unexpected intr type\n");
1197 break;
1198 }
1199
1200 /**
1201 * read out to clear the ready-to-be-read flag
1202 * for epoll_wait.
1203 */
1204 if (bytes_read == 0)
1205 return;
1206 do {
1207 nbytes = read(fd, &buf, bytes_read);
1208 if (nbytes < 0) {
1209 if (errno == EINTR || errno == EWOULDBLOCK ||
1210 errno == EAGAIN)
1211 continue;
1212 RTE_LOG(ERR, EAL,
1213 "Error reading from fd %d: %s\n",
1214 fd, strerror(errno));
1215 } else if (nbytes == 0)
1216 RTE_LOG(ERR, EAL, "Read nothing from fd %d\n", fd);
1217 return;
1218 } while (1);
1219 }
1220
1221 static int
eal_epoll_process_event(struct epoll_event * evs,unsigned int n,struct rte_epoll_event * events)1222 eal_epoll_process_event(struct epoll_event *evs, unsigned int n,
1223 struct rte_epoll_event *events)
1224 {
1225 unsigned int i, count = 0;
1226 struct rte_epoll_event *rev;
1227 uint32_t valid_status;
1228
1229 for (i = 0; i < n; i++) {
1230 rev = evs[i].data.ptr;
1231 valid_status = RTE_EPOLL_VALID;
1232 /* ACQUIRE memory ordering here pairs with RELEASE
1233 * ordering below acting as a lock to synchronize
1234 * the event data updating.
1235 */
1236 if (!rev || !__atomic_compare_exchange_n(&rev->status,
1237 &valid_status, RTE_EPOLL_EXEC, 0,
1238 __ATOMIC_ACQUIRE, __ATOMIC_RELAXED))
1239 continue;
1240
1241 events[count].status = RTE_EPOLL_VALID;
1242 events[count].fd = rev->fd;
1243 events[count].epfd = rev->epfd;
1244 events[count].epdata.event = rev->epdata.event;
1245 events[count].epdata.data = rev->epdata.data;
1246 if (rev->epdata.cb_fun)
1247 rev->epdata.cb_fun(rev->fd,
1248 rev->epdata.cb_arg);
1249
1250 /* the status update should be observed after
1251 * the other fields change.
1252 */
1253 __atomic_store_n(&rev->status, RTE_EPOLL_VALID,
1254 __ATOMIC_RELEASE);
1255 count++;
1256 }
1257 return count;
1258 }
1259
1260 static inline int
eal_init_tls_epfd(void)1261 eal_init_tls_epfd(void)
1262 {
1263 int pfd = epoll_create(255);
1264
1265 if (pfd < 0) {
1266 RTE_LOG(ERR, EAL,
1267 "Cannot create epoll instance\n");
1268 return -1;
1269 }
1270 return pfd;
1271 }
1272
1273 int
rte_intr_tls_epfd(void)1274 rte_intr_tls_epfd(void)
1275 {
1276 if (RTE_PER_LCORE(_epfd) == -1)
1277 RTE_PER_LCORE(_epfd) = eal_init_tls_epfd();
1278
1279 return RTE_PER_LCORE(_epfd);
1280 }
1281
1282 static int
eal_epoll_wait(int epfd,struct rte_epoll_event * events,int maxevents,int timeout,bool interruptible)1283 eal_epoll_wait(int epfd, struct rte_epoll_event *events,
1284 int maxevents, int timeout, bool interruptible)
1285 {
1286 struct epoll_event evs[maxevents];
1287 int rc;
1288
1289 if (!events) {
1290 RTE_LOG(ERR, EAL, "rte_epoll_event can't be NULL\n");
1291 return -1;
1292 }
1293
1294 /* using per thread epoll fd */
1295 if (epfd == RTE_EPOLL_PER_THREAD)
1296 epfd = rte_intr_tls_epfd();
1297
1298 while (1) {
1299 rc = epoll_wait(epfd, evs, maxevents, timeout);
1300 if (likely(rc > 0)) {
1301 /* epoll_wait has at least one fd ready to read */
1302 rc = eal_epoll_process_event(evs, rc, events);
1303 break;
1304 } else if (rc < 0) {
1305 if (errno == EINTR) {
1306 if (interruptible)
1307 return -1;
1308 else
1309 continue;
1310 }
1311 /* epoll_wait fail */
1312 RTE_LOG(ERR, EAL, "epoll_wait returns with fail %s\n",
1313 strerror(errno));
1314 rc = -1;
1315 break;
1316 } else {
1317 /* rc == 0, epoll_wait timed out */
1318 break;
1319 }
1320 }
1321
1322 return rc;
1323 }
1324
1325 int
rte_epoll_wait(int epfd,struct rte_epoll_event * events,int maxevents,int timeout)1326 rte_epoll_wait(int epfd, struct rte_epoll_event *events,
1327 int maxevents, int timeout)
1328 {
1329 return eal_epoll_wait(epfd, events, maxevents, timeout, false);
1330 }
1331
1332 int
rte_epoll_wait_interruptible(int epfd,struct rte_epoll_event * events,int maxevents,int timeout)1333 rte_epoll_wait_interruptible(int epfd, struct rte_epoll_event *events,
1334 int maxevents, int timeout)
1335 {
1336 return eal_epoll_wait(epfd, events, maxevents, timeout, true);
1337 }
1338
1339 static inline void
eal_epoll_data_safe_free(struct rte_epoll_event * ev)1340 eal_epoll_data_safe_free(struct rte_epoll_event *ev)
1341 {
1342 uint32_t valid_status = RTE_EPOLL_VALID;
1343
1344 while (!__atomic_compare_exchange_n(&ev->status, &valid_status,
1345 RTE_EPOLL_INVALID, 0, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED)) {
1346 while (__atomic_load_n(&ev->status,
1347 __ATOMIC_RELAXED) != RTE_EPOLL_VALID)
1348 rte_pause();
1349 valid_status = RTE_EPOLL_VALID;
1350 }
1351 memset(&ev->epdata, 0, sizeof(ev->epdata));
1352 ev->fd = -1;
1353 ev->epfd = -1;
1354 }
1355
1356 int
rte_epoll_ctl(int epfd,int op,int fd,struct rte_epoll_event * event)1357 rte_epoll_ctl(int epfd, int op, int fd,
1358 struct rte_epoll_event *event)
1359 {
1360 struct epoll_event ev;
1361
1362 if (!event) {
1363 RTE_LOG(ERR, EAL, "rte_epoll_event can't be NULL\n");
1364 return -1;
1365 }
1366
1367 /* using per thread epoll fd */
1368 if (epfd == RTE_EPOLL_PER_THREAD)
1369 epfd = rte_intr_tls_epfd();
1370
1371 if (op == EPOLL_CTL_ADD) {
1372 __atomic_store_n(&event->status, RTE_EPOLL_VALID,
1373 __ATOMIC_RELAXED);
1374 event->fd = fd; /* ignore fd in event */
1375 event->epfd = epfd;
1376 ev.data.ptr = (void *)event;
1377 }
1378
1379 ev.events = event->epdata.event;
1380 if (epoll_ctl(epfd, op, fd, &ev) < 0) {
1381 RTE_LOG(ERR, EAL, "Error op %d fd %d epoll_ctl, %s\n",
1382 op, fd, strerror(errno));
1383 if (op == EPOLL_CTL_ADD)
1384 /* rollback status when CTL_ADD fail */
1385 __atomic_store_n(&event->status, RTE_EPOLL_INVALID,
1386 __ATOMIC_RELAXED);
1387 return -1;
1388 }
1389
1390 if (op == EPOLL_CTL_DEL && __atomic_load_n(&event->status,
1391 __ATOMIC_RELAXED) != RTE_EPOLL_INVALID)
1392 eal_epoll_data_safe_free(event);
1393
1394 return 0;
1395 }
1396
1397 int
rte_intr_rx_ctl(struct rte_intr_handle * intr_handle,int epfd,int op,unsigned int vec,void * data)1398 rte_intr_rx_ctl(struct rte_intr_handle *intr_handle, int epfd,
1399 int op, unsigned int vec, void *data)
1400 {
1401 struct rte_epoll_event *rev;
1402 struct rte_epoll_data *epdata;
1403 int epfd_op;
1404 unsigned int efd_idx;
1405 int rc = 0;
1406
1407 efd_idx = (vec >= RTE_INTR_VEC_RXTX_OFFSET) ?
1408 (vec - RTE_INTR_VEC_RXTX_OFFSET) : vec;
1409
1410 if (!intr_handle || intr_handle->nb_efd == 0 ||
1411 efd_idx >= intr_handle->nb_efd) {
1412 RTE_LOG(ERR, EAL, "Wrong intr vector number.\n");
1413 return -EPERM;
1414 }
1415
1416 switch (op) {
1417 case RTE_INTR_EVENT_ADD:
1418 epfd_op = EPOLL_CTL_ADD;
1419 rev = &intr_handle->elist[efd_idx];
1420 if (__atomic_load_n(&rev->status,
1421 __ATOMIC_RELAXED) != RTE_EPOLL_INVALID) {
1422 RTE_LOG(INFO, EAL, "Event already been added.\n");
1423 return -EEXIST;
1424 }
1425
1426 /* attach to intr vector fd */
1427 epdata = &rev->epdata;
1428 epdata->event = EPOLLIN | EPOLLPRI | EPOLLET;
1429 epdata->data = data;
1430 epdata->cb_fun = (rte_intr_event_cb_t)eal_intr_proc_rxtx_intr;
1431 epdata->cb_arg = (void *)intr_handle;
1432 rc = rte_epoll_ctl(epfd, epfd_op,
1433 intr_handle->efds[efd_idx], rev);
1434 if (!rc)
1435 RTE_LOG(DEBUG, EAL,
1436 "efd %d associated with vec %d added on epfd %d"
1437 "\n", rev->fd, vec, epfd);
1438 else
1439 rc = -EPERM;
1440 break;
1441 case RTE_INTR_EVENT_DEL:
1442 epfd_op = EPOLL_CTL_DEL;
1443 rev = &intr_handle->elist[efd_idx];
1444 if (__atomic_load_n(&rev->status,
1445 __ATOMIC_RELAXED) == RTE_EPOLL_INVALID) {
1446 RTE_LOG(INFO, EAL, "Event does not exist.\n");
1447 return -EPERM;
1448 }
1449
1450 rc = rte_epoll_ctl(rev->epfd, epfd_op, rev->fd, rev);
1451 if (rc)
1452 rc = -EPERM;
1453 break;
1454 default:
1455 RTE_LOG(ERR, EAL, "event op type mismatch\n");
1456 rc = -EPERM;
1457 }
1458
1459 return rc;
1460 }
1461
1462 void
rte_intr_free_epoll_fd(struct rte_intr_handle * intr_handle)1463 rte_intr_free_epoll_fd(struct rte_intr_handle *intr_handle)
1464 {
1465 uint32_t i;
1466 struct rte_epoll_event *rev;
1467
1468 for (i = 0; i < intr_handle->nb_efd; i++) {
1469 rev = &intr_handle->elist[i];
1470 if (__atomic_load_n(&rev->status,
1471 __ATOMIC_RELAXED) == RTE_EPOLL_INVALID)
1472 continue;
1473 if (rte_epoll_ctl(rev->epfd, EPOLL_CTL_DEL, rev->fd, rev)) {
1474 /* force free if the entry valid */
1475 eal_epoll_data_safe_free(rev);
1476 }
1477 }
1478 }
1479
1480 int
rte_intr_efd_enable(struct rte_intr_handle * intr_handle,uint32_t nb_efd)1481 rte_intr_efd_enable(struct rte_intr_handle *intr_handle, uint32_t nb_efd)
1482 {
1483 uint32_t i;
1484 int fd;
1485 uint32_t n = RTE_MIN(nb_efd, (uint32_t)RTE_MAX_RXTX_INTR_VEC_ID);
1486
1487 assert(nb_efd != 0);
1488
1489 if (intr_handle->type == RTE_INTR_HANDLE_VFIO_MSIX) {
1490 for (i = 0; i < n; i++) {
1491 fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
1492 if (fd < 0) {
1493 RTE_LOG(ERR, EAL,
1494 "can't setup eventfd, error %i (%s)\n",
1495 errno, strerror(errno));
1496 return -errno;
1497 }
1498 intr_handle->efds[i] = fd;
1499 }
1500 intr_handle->nb_efd = n;
1501 intr_handle->max_intr = NB_OTHER_INTR + n;
1502 } else if (intr_handle->type == RTE_INTR_HANDLE_VDEV) {
1503 /* only check, initialization would be done in vdev driver.*/
1504 if (intr_handle->efd_counter_size >
1505 sizeof(union rte_intr_read_buffer)) {
1506 RTE_LOG(ERR, EAL, "the efd_counter_size is oversized");
1507 return -EINVAL;
1508 }
1509 } else {
1510 intr_handle->efds[0] = intr_handle->fd;
1511 intr_handle->nb_efd = RTE_MIN(nb_efd, 1U);
1512 intr_handle->max_intr = NB_OTHER_INTR;
1513 }
1514
1515 return 0;
1516 }
1517
1518 void
rte_intr_efd_disable(struct rte_intr_handle * intr_handle)1519 rte_intr_efd_disable(struct rte_intr_handle *intr_handle)
1520 {
1521 uint32_t i;
1522
1523 rte_intr_free_epoll_fd(intr_handle);
1524 if (intr_handle->max_intr > intr_handle->nb_efd) {
1525 for (i = 0; i < intr_handle->nb_efd; i++)
1526 close(intr_handle->efds[i]);
1527 }
1528 intr_handle->nb_efd = 0;
1529 intr_handle->max_intr = 0;
1530 }
1531
1532 int
rte_intr_dp_is_en(struct rte_intr_handle * intr_handle)1533 rte_intr_dp_is_en(struct rte_intr_handle *intr_handle)
1534 {
1535 return !(!intr_handle->nb_efd);
1536 }
1537
1538 int
rte_intr_allow_others(struct rte_intr_handle * intr_handle)1539 rte_intr_allow_others(struct rte_intr_handle *intr_handle)
1540 {
1541 if (!rte_intr_dp_is_en(intr_handle))
1542 return 1;
1543 else
1544 return !!(intr_handle->max_intr - intr_handle->nb_efd);
1545 }
1546
1547 int
rte_intr_cap_multiple(struct rte_intr_handle * intr_handle)1548 rte_intr_cap_multiple(struct rte_intr_handle *intr_handle)
1549 {
1550 if (intr_handle->type == RTE_INTR_HANDLE_VFIO_MSIX)
1551 return 1;
1552
1553 if (intr_handle->type == RTE_INTR_HANDLE_VDEV)
1554 return 1;
1555
1556 return 0;
1557 }
1558
rte_thread_is_intr(void)1559 int rte_thread_is_intr(void)
1560 {
1561 return pthread_equal(intr_thread, pthread_self());
1562 }
1563