1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
15 #include <sys/epoll.h>
16 #include <sys/signalfd.h>
17 #include <sys/ioctl.h>
18 #include <sys/eventfd.h>
22 #include <rte_common.h>
23 #include <rte_interrupts.h>
24 #include <rte_memory.h>
25 #include <rte_launch.h>
27 #include <rte_per_lcore.h>
28 #include <rte_lcore.h>
29 #include <rte_branch_prediction.h>
30 #include <rte_debug.h>
32 #include <rte_errno.h>
33 #include <rte_spinlock.h>
34 #include <rte_pause.h>
36 #include <rte_eal_trace.h>
38 #include "eal_private.h"
40 #include "eal_thread.h"
42 #define EAL_INTR_EPOLL_WAIT_FOREVER (-1)
43 #define NB_OTHER_INTR 1
45 static RTE_DEFINE_PER_LCORE(int, _epfd) = -1; /**< epoll fd per thread */
61 * union buffer for reading on different devices
63 union rte_intr_read_buffer {
64 int uio_intr_count; /* for uio device */
66 uint64_t vfio_intr_count; /* for vfio device */
68 uint64_t timerfd_num; /* for timerfd */
69 char charbuf[16]; /* for others */
72 TAILQ_HEAD(rte_intr_cb_list, rte_intr_callback);
73 TAILQ_HEAD(rte_intr_source_list, rte_intr_source);
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 */
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 */
90 /* global spinlock for interrupt data operation */
91 static rte_spinlock_t intr_lock = RTE_SPINLOCK_INITIALIZER;
93 /* union buffer for pipe read/write */
94 static union intr_pipefds intr_pipe;
96 /* interrupt sources list */
97 static struct rte_intr_source_list intr_sources;
99 /* interrupt handling thread */
100 static pthread_t intr_thread;
102 /* VFIO interrupts */
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))
110 /* enable legacy (INTx) interrupts */
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];
118 len = sizeof(irq_set_buf);
121 irq_set = (struct vfio_irq_set *) irq_set_buf;
122 irq_set->argsz = len;
124 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
125 irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
127 fd_ptr = (int *) &irq_set->data;
128 *fd_ptr = intr_handle->fd;
130 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
133 RTE_LOG(ERR, EAL, "Error enabling INTx interrupts for fd %d\n",
138 /* unmask INTx after enabling */
139 memset(irq_set, 0, len);
140 len = sizeof(struct vfio_irq_set);
141 irq_set->argsz = len;
143 irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK;
144 irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
147 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
150 RTE_LOG(ERR, EAL, "Error unmasking INTx interrupts for fd %d\n",
157 /* disable legacy (INTx) interrupts */
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];
164 len = sizeof(struct vfio_irq_set);
166 /* mask interrupts before disabling */
167 irq_set = (struct vfio_irq_set *) irq_set_buf;
168 irq_set->argsz = len;
170 irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK;
171 irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
174 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
177 RTE_LOG(ERR, EAL, "Error masking INTx interrupts for fd %d\n",
183 memset(irq_set, 0, len);
184 irq_set->argsz = len;
186 irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
187 irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
190 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
194 "Error disabling INTx interrupts for fd %d\n", intr_handle->fd);
200 /* unmask/ack legacy (INTx) interrupts */
202 vfio_ack_intx(const struct rte_intr_handle *intr_handle)
204 struct vfio_irq_set irq_set;
207 memset(&irq_set, 0, sizeof(irq_set));
208 irq_set.argsz = sizeof(irq_set);
210 irq_set.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK;
211 irq_set.index = VFIO_PCI_INTX_IRQ_INDEX;
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",
222 /* enable MSI interrupts */
224 vfio_enable_msi(const struct rte_intr_handle *intr_handle) {
226 char irq_set_buf[IRQ_SET_BUF_LEN];
227 struct vfio_irq_set *irq_set;
230 len = sizeof(irq_set_buf);
232 irq_set = (struct vfio_irq_set *) irq_set_buf;
233 irq_set->argsz = len;
235 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
236 irq_set->index = VFIO_PCI_MSI_IRQ_INDEX;
238 fd_ptr = (int *) &irq_set->data;
239 *fd_ptr = intr_handle->fd;
241 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
244 RTE_LOG(ERR, EAL, "Error enabling MSI interrupts for fd %d\n",
251 /* disable MSI interrupts */
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];
258 len = sizeof(struct vfio_irq_set);
260 irq_set = (struct vfio_irq_set *) irq_set_buf;
261 irq_set->argsz = len;
263 irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
264 irq_set->index = VFIO_PCI_MSI_IRQ_INDEX;
267 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
271 "Error disabling MSI interrupts for fd %d\n", intr_handle->fd);
276 /* enable MSI-X interrupts */
278 vfio_enable_msix(const struct rte_intr_handle *intr_handle) {
280 char irq_set_buf[MSIX_IRQ_SET_BUF_LEN];
281 struct vfio_irq_set *irq_set;
284 len = sizeof(irq_set_buf);
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;
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);
301 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
304 RTE_LOG(ERR, EAL, "Error enabling MSI-X interrupts for fd %d\n",
312 /* disable MSI-X interrupts */
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];
319 len = sizeof(struct vfio_irq_set);
321 irq_set = (struct vfio_irq_set *) irq_set_buf;
322 irq_set->argsz = len;
324 irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
325 irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX;
328 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
332 "Error disabling MSI-X interrupts for fd %d\n", intr_handle->fd);
337 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
338 /* enable req notifier */
340 vfio_enable_req(const struct rte_intr_handle *intr_handle)
343 char irq_set_buf[IRQ_SET_BUF_LEN];
344 struct vfio_irq_set *irq_set;
347 len = sizeof(irq_set_buf);
349 irq_set = (struct vfio_irq_set *) irq_set_buf;
350 irq_set->argsz = len;
352 irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
353 VFIO_IRQ_SET_ACTION_TRIGGER;
354 irq_set->index = VFIO_PCI_REQ_IRQ_INDEX;
356 fd_ptr = (int *) &irq_set->data;
357 *fd_ptr = intr_handle->fd;
359 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
362 RTE_LOG(ERR, EAL, "Error enabling req interrupts for fd %d\n",
370 /* disable req notifier */
372 vfio_disable_req(const struct rte_intr_handle *intr_handle)
374 struct vfio_irq_set *irq_set;
375 char irq_set_buf[IRQ_SET_BUF_LEN];
378 len = sizeof(struct vfio_irq_set);
380 irq_set = (struct vfio_irq_set *) irq_set_buf;
381 irq_set->argsz = len;
383 irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
384 irq_set->index = VFIO_PCI_REQ_IRQ_INDEX;
387 ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
390 RTE_LOG(ERR, EAL, "Error disabling req interrupts for fd %d\n",
399 uio_intx_intr_disable(const struct rte_intr_handle *intr_handle)
401 unsigned char command_high;
403 /* use UIO config file descriptor for uio_pci_generic */
404 if (pread(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
406 "Error reading interrupts status for fd %d\n",
407 intr_handle->uio_cfg_fd);
410 /* disable interrupts */
412 if (pwrite(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
414 "Error disabling interrupts for fd %d\n",
415 intr_handle->uio_cfg_fd);
423 uio_intx_intr_enable(const struct rte_intr_handle *intr_handle)
425 unsigned char command_high;
427 /* use UIO config file descriptor for uio_pci_generic */
428 if (pread(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
430 "Error reading interrupts status for fd %d\n",
431 intr_handle->uio_cfg_fd);
434 /* enable interrupts */
435 command_high &= ~0x4;
436 if (pwrite(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
438 "Error enabling interrupts for fd %d\n",
439 intr_handle->uio_cfg_fd);
447 uio_intr_disable(const struct rte_intr_handle *intr_handle)
451 if (write(intr_handle->fd, &value, sizeof(value)) < 0) {
453 "Error disabling interrupts for fd %d (%s)\n",
454 intr_handle->fd, strerror(errno));
461 uio_intr_enable(const struct rte_intr_handle *intr_handle)
465 if (write(intr_handle->fd, &value, sizeof(value)) < 0) {
467 "Error enabling interrupts for fd %d (%s)\n",
468 intr_handle->fd, strerror(errno));
475 rte_intr_callback_register(const struct rte_intr_handle *intr_handle,
476 rte_intr_callback_fn cb, void *cb_arg)
478 int ret, wake_thread;
479 struct rte_intr_source *src;
480 struct rte_intr_callback *callback;
484 /* first do parameter checking */
485 if (intr_handle == NULL || intr_handle->fd < 0 || cb == NULL) {
487 "Registering with invalid input parameter\n");
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");
497 callback->cb_fn = cb;
498 callback->cb_arg = cb_arg;
499 callback->pending_delete = 0;
500 callback->ucb_fn = NULL;
502 rte_spinlock_lock(&intr_lock);
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))
511 TAILQ_INSERT_TAIL(&(src->callbacks), callback, next);
517 /* no existing callbacks for this - add new source */
519 src = calloc(1, sizeof(*src));
521 RTE_LOG(ERR, EAL, "Can not allocate memory\n");
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);
534 rte_spinlock_unlock(&intr_lock);
537 * check if need to notify the pipe fd waited by epoll_wait to
538 * rebuild the wait list.
541 if (write(intr_pipe.writefd, "1", 1) < 0)
544 rte_eal_trace_intr_callback_register(intr_handle, cb, cb_arg, ret);
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)
554 struct rte_intr_source *src;
555 struct rte_intr_callback *cb, *next;
557 /* do parameter checking first */
558 if (intr_handle == NULL || intr_handle->fd < 0) {
560 "Unregistering with invalid input parameter\n");
564 rte_spinlock_lock(&intr_lock);
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)
571 /* No interrupt source registered for the fd */
575 /* only usable if the source is active */
576 } else if (src->active == 0) {
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;
594 rte_spinlock_unlock(&intr_lock);
600 rte_intr_callback_unregister(const struct rte_intr_handle *intr_handle,
601 rte_intr_callback_fn cb_fn, void *cb_arg)
604 struct rte_intr_source *src;
605 struct rte_intr_callback *cb, *next;
607 /* do parameter checking first */
608 if (intr_handle == NULL || intr_handle->fd < 0) {
610 "Unregistering with invalid input parameter\n");
614 rte_spinlock_lock(&intr_lock);
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)
621 /* No interrupt source registered for the fd */
625 /* interrupt source has some active callbacks right now. */
626 } else if (src->active != 0) {
633 /*walk through the callbacks and remove all that match. */
634 for (cb = TAILQ_FIRST(&src->callbacks); cb != NULL; cb = next) {
636 next = TAILQ_NEXT(cb, next);
638 if (cb->cb_fn == cb_fn && (cb_arg == (void *)-1 ||
639 cb->cb_arg == cb_arg)) {
640 TAILQ_REMOVE(&src->callbacks, cb, next);
646 /* all callbacks for that source are removed. */
647 if (TAILQ_EMPTY(&src->callbacks)) {
648 TAILQ_REMOVE(&intr_sources, src, next);
653 rte_spinlock_unlock(&intr_lock);
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) {
660 rte_eal_trace_intr_callback_unregister(intr_handle, cb_fn, cb_arg,
666 rte_intr_enable(const struct rte_intr_handle *intr_handle)
670 if (intr_handle && intr_handle->type == RTE_INTR_HANDLE_VDEV) {
675 if (!intr_handle || intr_handle->fd < 0 ||
676 intr_handle->uio_cfg_fd < 0) {
681 switch (intr_handle->type){
682 /* write to the uio fd to enable the interrupt */
683 case RTE_INTR_HANDLE_UIO:
684 if (uio_intr_enable(intr_handle))
687 case RTE_INTR_HANDLE_UIO_INTX:
688 if (uio_intx_intr_enable(intr_handle))
691 /* not used at this moment */
692 case RTE_INTR_HANDLE_ALARM:
696 case RTE_INTR_HANDLE_VFIO_MSIX:
697 if (vfio_enable_msix(intr_handle))
700 case RTE_INTR_HANDLE_VFIO_MSI:
701 if (vfio_enable_msi(intr_handle))
704 case RTE_INTR_HANDLE_VFIO_LEGACY:
705 if (vfio_enable_intx(intr_handle))
708 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
709 case RTE_INTR_HANDLE_VFIO_REQ:
710 if (vfio_enable_req(intr_handle))
715 /* not used at this moment */
716 case RTE_INTR_HANDLE_DEV_EVENT:
719 /* unknown handle type */
722 "Unknown handle type of fd %d\n",
728 rte_eal_trace_intr_enable(intr_handle, rc);
733 * PMD generally calls this function at the end of its IRQ callback.
734 * Internally, it unmasks the interrupt if possible.
736 * For INTx, unmasking is required as the interrupt is auto-masked prior to
739 * For MSI/MSI-X, unmasking is typically not needed as the interrupt is not
740 * auto-masked. In fact, for interrupt handle types VFIO_MSIX and VFIO_MSI,
741 * this function is no-op.
744 rte_intr_ack(const struct rte_intr_handle *intr_handle)
746 if (intr_handle && intr_handle->type == RTE_INTR_HANDLE_VDEV)
749 if (!intr_handle || intr_handle->fd < 0 || intr_handle->uio_cfg_fd < 0)
752 switch (intr_handle->type) {
753 /* Both acking and enabling are same for UIO */
754 case RTE_INTR_HANDLE_UIO:
755 if (uio_intr_enable(intr_handle))
758 case RTE_INTR_HANDLE_UIO_INTX:
759 if (uio_intx_intr_enable(intr_handle))
762 /* not used at this moment */
763 case RTE_INTR_HANDLE_ALARM:
766 /* VFIO MSI* is implicitly acked unlike INTx, nothing to do */
767 case RTE_INTR_HANDLE_VFIO_MSIX:
768 case RTE_INTR_HANDLE_VFIO_MSI:
770 case RTE_INTR_HANDLE_VFIO_LEGACY:
771 if (vfio_ack_intx(intr_handle))
774 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
775 case RTE_INTR_HANDLE_VFIO_REQ:
779 /* not used at this moment */
780 case RTE_INTR_HANDLE_DEV_EVENT:
782 /* unknown handle type */
784 RTE_LOG(ERR, EAL, "Unknown handle type of fd %d\n",
793 rte_intr_disable(const struct rte_intr_handle *intr_handle)
797 if (intr_handle && intr_handle->type == RTE_INTR_HANDLE_VDEV) {
802 if (!intr_handle || intr_handle->fd < 0 ||
803 intr_handle->uio_cfg_fd < 0) {
808 switch (intr_handle->type){
809 /* write to the uio fd to disable the interrupt */
810 case RTE_INTR_HANDLE_UIO:
811 if (uio_intr_disable(intr_handle))
814 case RTE_INTR_HANDLE_UIO_INTX:
815 if (uio_intx_intr_disable(intr_handle))
818 /* not used at this moment */
819 case RTE_INTR_HANDLE_ALARM:
823 case RTE_INTR_HANDLE_VFIO_MSIX:
824 if (vfio_disable_msix(intr_handle))
827 case RTE_INTR_HANDLE_VFIO_MSI:
828 if (vfio_disable_msi(intr_handle))
831 case RTE_INTR_HANDLE_VFIO_LEGACY:
832 if (vfio_disable_intx(intr_handle))
835 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
836 case RTE_INTR_HANDLE_VFIO_REQ:
837 if (vfio_disable_req(intr_handle))
842 /* not used at this moment */
843 case RTE_INTR_HANDLE_DEV_EVENT:
846 /* unknown handle type */
849 "Unknown handle type of fd %d\n",
855 rte_eal_trace_intr_disable(intr_handle, rc);
860 eal_intr_process_interrupts(struct epoll_event *events, int nfds)
863 int n, bytes_read, rv;
864 struct rte_intr_source *src;
865 struct rte_intr_callback *cb, *next;
866 union rte_intr_read_buffer buf;
867 struct rte_intr_callback active_cb;
869 for (n = 0; n < nfds; n++) {
872 * if the pipe fd is ready to read, return out to
873 * rebuild the wait list.
875 if (events[n].data.fd == intr_pipe.readfd){
876 int r = read(intr_pipe.readfd, buf.charbuf,
877 sizeof(buf.charbuf));
881 rte_spinlock_lock(&intr_lock);
882 TAILQ_FOREACH(src, &intr_sources, next)
883 if (src->intr_handle.fd ==
887 rte_spinlock_unlock(&intr_lock);
891 /* mark this interrupt source as active and release the lock. */
893 rte_spinlock_unlock(&intr_lock);
895 /* set the length to be read dor different handle type */
896 switch (src->intr_handle.type) {
897 case RTE_INTR_HANDLE_UIO:
898 case RTE_INTR_HANDLE_UIO_INTX:
899 bytes_read = sizeof(buf.uio_intr_count);
901 case RTE_INTR_HANDLE_ALARM:
902 bytes_read = sizeof(buf.timerfd_num);
905 case RTE_INTR_HANDLE_VFIO_MSIX:
906 case RTE_INTR_HANDLE_VFIO_MSI:
907 case RTE_INTR_HANDLE_VFIO_LEGACY:
908 bytes_read = sizeof(buf.vfio_intr_count);
910 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
911 case RTE_INTR_HANDLE_VFIO_REQ:
917 case RTE_INTR_HANDLE_VDEV:
918 case RTE_INTR_HANDLE_EXT:
922 case RTE_INTR_HANDLE_DEV_EVENT:
931 if (bytes_read > 0) {
933 * read out to clear the ready-to-be-read flag
936 bytes_read = read(events[n].data.fd, &buf, bytes_read);
937 if (bytes_read < 0) {
938 if (errno == EINTR || errno == EWOULDBLOCK)
941 RTE_LOG(ERR, EAL, "Error reading from file "
942 "descriptor %d: %s\n",
946 * The device is unplugged or buggy, remove
947 * it as an interrupt source and return to
948 * force the wait list to be rebuilt.
950 rte_spinlock_lock(&intr_lock);
951 TAILQ_REMOVE(&intr_sources, src, next);
952 rte_spinlock_unlock(&intr_lock);
954 for (cb = TAILQ_FIRST(&src->callbacks); cb;
956 next = TAILQ_NEXT(cb, next);
957 TAILQ_REMOVE(&src->callbacks, cb, next);
962 } else if (bytes_read == 0)
963 RTE_LOG(ERR, EAL, "Read nothing from file "
964 "descriptor %d\n", events[n].data.fd);
969 /* grab a lock, again to call callbacks and update status. */
970 rte_spinlock_lock(&intr_lock);
974 /* Finally, call all callbacks. */
975 TAILQ_FOREACH(cb, &src->callbacks, next) {
977 /* make a copy and unlock. */
979 rte_spinlock_unlock(&intr_lock);
981 /* call the actual callback */
982 active_cb.cb_fn(active_cb.cb_arg);
984 /*get the lock back. */
985 rte_spinlock_lock(&intr_lock);
988 /* we done with that interrupt source, release it. */
993 /* check if any callback are supposed to be removed */
994 for (cb = TAILQ_FIRST(&src->callbacks); cb != NULL; cb = next) {
995 next = TAILQ_NEXT(cb, next);
996 if (cb->pending_delete) {
997 TAILQ_REMOVE(&src->callbacks, cb, next);
999 cb->ucb_fn(&src->intr_handle, cb->cb_arg);
1005 /* all callbacks for that source are removed. */
1006 if (TAILQ_EMPTY(&src->callbacks)) {
1007 TAILQ_REMOVE(&intr_sources, src, next);
1011 /* notify the pipe fd waited by epoll_wait to rebuild the wait list */
1012 if (rv > 0 && write(intr_pipe.writefd, "1", 1) < 0) {
1013 rte_spinlock_unlock(&intr_lock);
1017 rte_spinlock_unlock(&intr_lock);
1024 * It handles all the interrupts.
1027 * epoll file descriptor.
1029 * The number of file descriptors added in epoll.
1035 eal_intr_handle_interrupts(int pfd, unsigned totalfds)
1037 struct epoll_event events[totalfds];
1041 nfds = epoll_wait(pfd, events, totalfds,
1042 EAL_INTR_EPOLL_WAIT_FOREVER);
1043 /* epoll_wait fail */
1048 "epoll_wait returns with fail\n");
1051 /* epoll_wait timeout, will never happens here */
1054 /* epoll_wait has at least one fd ready to read */
1055 if (eal_intr_process_interrupts(events, nfds) < 0)
1061 * It builds/rebuilds up the epoll file descriptor with all the
1062 * file descriptors being waited on. Then handles the interrupts.
1070 static __rte_noreturn void *
1071 eal_intr_thread_main(__rte_unused void *arg)
1073 /* host thread, never break out */
1075 /* build up the epoll fd with all descriptors we are to
1076 * wait on then pass it to the handle_interrupts function
1078 static struct epoll_event pipe_event = {
1079 .events = EPOLLIN | EPOLLPRI,
1081 struct rte_intr_source *src;
1082 unsigned numfds = 0;
1084 /* create epoll fd */
1085 int pfd = epoll_create(1);
1087 rte_panic("Cannot create epoll instance\n");
1089 pipe_event.data.fd = intr_pipe.readfd;
1091 * add pipe fd into wait list, this pipe is used to
1092 * rebuild the wait list.
1094 if (epoll_ctl(pfd, EPOLL_CTL_ADD, intr_pipe.readfd,
1096 rte_panic("Error adding fd to %d epoll_ctl, %s\n",
1097 intr_pipe.readfd, strerror(errno));
1101 rte_spinlock_lock(&intr_lock);
1103 TAILQ_FOREACH(src, &intr_sources, next) {
1104 struct epoll_event ev;
1106 if (src->callbacks.tqh_first == NULL)
1107 continue; /* skip those with no callbacks */
1108 memset(&ev, 0, sizeof(ev));
1109 ev.events = EPOLLIN | EPOLLPRI | EPOLLRDHUP | EPOLLHUP;
1110 ev.data.fd = src->intr_handle.fd;
1113 * add all the uio device file descriptor
1116 if (epoll_ctl(pfd, EPOLL_CTL_ADD,
1117 src->intr_handle.fd, &ev) < 0){
1118 rte_panic("Error adding fd %d epoll_ctl, %s\n",
1119 src->intr_handle.fd, strerror(errno));
1124 rte_spinlock_unlock(&intr_lock);
1125 /* serve the interrupt */
1126 eal_intr_handle_interrupts(pfd, numfds);
1129 * when we return, we need to rebuild the
1130 * list of fds to monitor.
1137 rte_eal_intr_init(void)
1141 /* init the global interrupt source head */
1142 TAILQ_INIT(&intr_sources);
1145 * create a pipe which will be waited by epoll and notified to
1146 * rebuild the wait list of epoll.
1148 if (pipe(intr_pipe.pipefd) < 0) {
1153 /* create the host thread to wait/handle the interrupt */
1154 ret = rte_ctrl_thread_create(&intr_thread, "eal-intr-thread", NULL,
1155 eal_intr_thread_main, NULL);
1159 "Failed to create thread for interrupt handling\n");
1166 eal_intr_proc_rxtx_intr(int fd, const struct rte_intr_handle *intr_handle)
1168 union rte_intr_read_buffer buf;
1172 switch (intr_handle->type) {
1173 case RTE_INTR_HANDLE_UIO:
1174 case RTE_INTR_HANDLE_UIO_INTX:
1175 bytes_read = sizeof(buf.uio_intr_count);
1178 case RTE_INTR_HANDLE_VFIO_MSIX:
1179 case RTE_INTR_HANDLE_VFIO_MSI:
1180 case RTE_INTR_HANDLE_VFIO_LEGACY:
1181 bytes_read = sizeof(buf.vfio_intr_count);
1184 case RTE_INTR_HANDLE_VDEV:
1185 bytes_read = intr_handle->efd_counter_size;
1186 /* For vdev, number of bytes to read is set by driver */
1188 case RTE_INTR_HANDLE_EXT:
1192 RTE_LOG(INFO, EAL, "unexpected intr type\n");
1197 * read out to clear the ready-to-be-read flag
1200 if (bytes_read == 0)
1203 nbytes = read(fd, &buf, bytes_read);
1205 if (errno == EINTR || errno == EWOULDBLOCK ||
1209 "Error reading from fd %d: %s\n",
1210 fd, strerror(errno));
1211 } else if (nbytes == 0)
1212 RTE_LOG(ERR, EAL, "Read nothing from fd %d\n", fd);
1218 eal_epoll_process_event(struct epoll_event *evs, unsigned int n,
1219 struct rte_epoll_event *events)
1221 unsigned int i, count = 0;
1222 struct rte_epoll_event *rev;
1223 uint32_t valid_status;
1225 for (i = 0; i < n; i++) {
1226 rev = evs[i].data.ptr;
1227 valid_status = RTE_EPOLL_VALID;
1228 /* ACQUIRE memory ordering here pairs with RELEASE
1229 * ordering below acting as a lock to synchronize
1230 * the event data updating.
1232 if (!rev || !__atomic_compare_exchange_n(&rev->status,
1233 &valid_status, RTE_EPOLL_EXEC, 0,
1234 __ATOMIC_ACQUIRE, __ATOMIC_RELAXED))
1237 events[count].status = RTE_EPOLL_VALID;
1238 events[count].fd = rev->fd;
1239 events[count].epfd = rev->epfd;
1240 events[count].epdata.event = rev->epdata.event;
1241 events[count].epdata.data = rev->epdata.data;
1242 if (rev->epdata.cb_fun)
1243 rev->epdata.cb_fun(rev->fd,
1244 rev->epdata.cb_arg);
1246 /* the status update should be observed after
1247 * the other fields change.
1249 __atomic_store_n(&rev->status, RTE_EPOLL_VALID,
1257 eal_init_tls_epfd(void)
1259 int pfd = epoll_create(255);
1263 "Cannot create epoll instance\n");
1270 rte_intr_tls_epfd(void)
1272 if (RTE_PER_LCORE(_epfd) == -1)
1273 RTE_PER_LCORE(_epfd) = eal_init_tls_epfd();
1275 return RTE_PER_LCORE(_epfd);
1279 rte_epoll_wait(int epfd, struct rte_epoll_event *events,
1280 int maxevents, int timeout)
1282 struct epoll_event evs[maxevents];
1286 RTE_LOG(ERR, EAL, "rte_epoll_event can't be NULL\n");
1290 /* using per thread epoll fd */
1291 if (epfd == RTE_EPOLL_PER_THREAD)
1292 epfd = rte_intr_tls_epfd();
1295 rc = epoll_wait(epfd, evs, maxevents, timeout);
1296 if (likely(rc > 0)) {
1297 /* epoll_wait has at least one fd ready to read */
1298 rc = eal_epoll_process_event(evs, rc, events);
1300 } else if (rc < 0) {
1303 /* epoll_wait fail */
1304 RTE_LOG(ERR, EAL, "epoll_wait returns with fail %s\n",
1309 /* rc == 0, epoll_wait timed out */
1318 eal_epoll_data_safe_free(struct rte_epoll_event *ev)
1320 uint32_t valid_status = RTE_EPOLL_VALID;
1322 while (!__atomic_compare_exchange_n(&ev->status, &valid_status,
1323 RTE_EPOLL_INVALID, 0, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED)) {
1324 while (__atomic_load_n(&ev->status,
1325 __ATOMIC_RELAXED) != RTE_EPOLL_VALID)
1327 valid_status = RTE_EPOLL_VALID;
1329 memset(&ev->epdata, 0, sizeof(ev->epdata));
1335 rte_epoll_ctl(int epfd, int op, int fd,
1336 struct rte_epoll_event *event)
1338 struct epoll_event ev;
1341 RTE_LOG(ERR, EAL, "rte_epoll_event can't be NULL\n");
1345 /* using per thread epoll fd */
1346 if (epfd == RTE_EPOLL_PER_THREAD)
1347 epfd = rte_intr_tls_epfd();
1349 if (op == EPOLL_CTL_ADD) {
1350 __atomic_store_n(&event->status, RTE_EPOLL_VALID,
1352 event->fd = fd; /* ignore fd in event */
1354 ev.data.ptr = (void *)event;
1357 ev.events = event->epdata.event;
1358 if (epoll_ctl(epfd, op, fd, &ev) < 0) {
1359 RTE_LOG(ERR, EAL, "Error op %d fd %d epoll_ctl, %s\n",
1360 op, fd, strerror(errno));
1361 if (op == EPOLL_CTL_ADD)
1362 /* rollback status when CTL_ADD fail */
1363 __atomic_store_n(&event->status, RTE_EPOLL_INVALID,
1368 if (op == EPOLL_CTL_DEL && __atomic_load_n(&event->status,
1369 __ATOMIC_RELAXED) != RTE_EPOLL_INVALID)
1370 eal_epoll_data_safe_free(event);
1376 rte_intr_rx_ctl(struct rte_intr_handle *intr_handle, int epfd,
1377 int op, unsigned int vec, void *data)
1379 struct rte_epoll_event *rev;
1380 struct rte_epoll_data *epdata;
1382 unsigned int efd_idx;
1385 efd_idx = (vec >= RTE_INTR_VEC_RXTX_OFFSET) ?
1386 (vec - RTE_INTR_VEC_RXTX_OFFSET) : vec;
1388 if (!intr_handle || intr_handle->nb_efd == 0 ||
1389 efd_idx >= intr_handle->nb_efd) {
1390 RTE_LOG(ERR, EAL, "Wrong intr vector number.\n");
1395 case RTE_INTR_EVENT_ADD:
1396 epfd_op = EPOLL_CTL_ADD;
1397 rev = &intr_handle->elist[efd_idx];
1398 if (__atomic_load_n(&rev->status,
1399 __ATOMIC_RELAXED) != RTE_EPOLL_INVALID) {
1400 RTE_LOG(INFO, EAL, "Event already been added.\n");
1404 /* attach to intr vector fd */
1405 epdata = &rev->epdata;
1406 epdata->event = EPOLLIN | EPOLLPRI | EPOLLET;
1407 epdata->data = data;
1408 epdata->cb_fun = (rte_intr_event_cb_t)eal_intr_proc_rxtx_intr;
1409 epdata->cb_arg = (void *)intr_handle;
1410 rc = rte_epoll_ctl(epfd, epfd_op,
1411 intr_handle->efds[efd_idx], rev);
1414 "efd %d associated with vec %d added on epfd %d"
1415 "\n", rev->fd, vec, epfd);
1419 case RTE_INTR_EVENT_DEL:
1420 epfd_op = EPOLL_CTL_DEL;
1421 rev = &intr_handle->elist[efd_idx];
1422 if (__atomic_load_n(&rev->status,
1423 __ATOMIC_RELAXED) == RTE_EPOLL_INVALID) {
1424 RTE_LOG(INFO, EAL, "Event does not exist.\n");
1428 rc = rte_epoll_ctl(rev->epfd, epfd_op, rev->fd, rev);
1433 RTE_LOG(ERR, EAL, "event op type mismatch\n");
1441 rte_intr_free_epoll_fd(struct rte_intr_handle *intr_handle)
1444 struct rte_epoll_event *rev;
1446 for (i = 0; i < intr_handle->nb_efd; i++) {
1447 rev = &intr_handle->elist[i];
1448 if (__atomic_load_n(&rev->status,
1449 __ATOMIC_RELAXED) == RTE_EPOLL_INVALID)
1451 if (rte_epoll_ctl(rev->epfd, EPOLL_CTL_DEL, rev->fd, rev)) {
1452 /* force free if the entry valid */
1453 eal_epoll_data_safe_free(rev);
1459 rte_intr_efd_enable(struct rte_intr_handle *intr_handle, uint32_t nb_efd)
1463 uint32_t n = RTE_MIN(nb_efd, (uint32_t)RTE_MAX_RXTX_INTR_VEC_ID);
1465 assert(nb_efd != 0);
1467 if (intr_handle->type == RTE_INTR_HANDLE_VFIO_MSIX) {
1468 for (i = 0; i < n; i++) {
1469 fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
1472 "can't setup eventfd, error %i (%s)\n",
1473 errno, strerror(errno));
1476 intr_handle->efds[i] = fd;
1478 intr_handle->nb_efd = n;
1479 intr_handle->max_intr = NB_OTHER_INTR + n;
1480 } else if (intr_handle->type == RTE_INTR_HANDLE_VDEV) {
1481 /* only check, initialization would be done in vdev driver.*/
1482 if (intr_handle->efd_counter_size >
1483 sizeof(union rte_intr_read_buffer)) {
1484 RTE_LOG(ERR, EAL, "the efd_counter_size is oversized");
1488 intr_handle->efds[0] = intr_handle->fd;
1489 intr_handle->nb_efd = RTE_MIN(nb_efd, 1U);
1490 intr_handle->max_intr = NB_OTHER_INTR;
1497 rte_intr_efd_disable(struct rte_intr_handle *intr_handle)
1501 rte_intr_free_epoll_fd(intr_handle);
1502 if (intr_handle->max_intr > intr_handle->nb_efd) {
1503 for (i = 0; i < intr_handle->nb_efd; i++)
1504 close(intr_handle->efds[i]);
1506 intr_handle->nb_efd = 0;
1507 intr_handle->max_intr = 0;
1511 rte_intr_dp_is_en(struct rte_intr_handle *intr_handle)
1513 return !(!intr_handle->nb_efd);
1517 rte_intr_allow_others(struct rte_intr_handle *intr_handle)
1519 if (!rte_intr_dp_is_en(intr_handle))
1522 return !!(intr_handle->max_intr - intr_handle->nb_efd);
1526 rte_intr_cap_multiple(struct rte_intr_handle *intr_handle)
1528 if (intr_handle->type == RTE_INTR_HANDLE_VFIO_MSIX)
1531 if (intr_handle->type == RTE_INTR_HANDLE_VDEV)
1537 int rte_thread_is_intr(void)
1539 return pthread_equal(intr_thread, pthread_self());