lib/librte_eal/linuxapp/eal/eal_interrupts.c

   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_atomic.h>
  30 #include <rte_branch_prediction.h>
  31 #include <rte_debug.h>
  32 #include <rte_log.h>
  33 #include <rte_errno.h>
  34 #include <rte_spinlock.h>
  35 #include <rte_pause.h>
  36
  37 #include "eal_private.h"
  38 #include "eal_vfio.h"
  39 #include "eal_thread.h"
  40
  41 #define EAL_INTR_EPOLL_WAIT_FOREVER (-1)
  42 #define NB_OTHER_INTR               1
  43
  44 static RTE_DEFINE_PER_LCORE(int, _epfd) = -1; /**< epoll fd per thread */
  45
  46 /**
  47  * union for pipe fds.
  48  */
  49 union intr_pipefds{
  50         struct {
  51                 int pipefd[2];
  52         };
  53         struct {
  54                 int readfd;
  55                 int writefd;
  56         };
  57 };
  58
  59 /**
  60  * union buffer for reading on different devices
  61  */
  62 union rte_intr_read_buffer {
  63         int uio_intr_count;              /* for uio device */
  64 #ifdef VFIO_PRESENT
  65         uint64_t vfio_intr_count;        /* for vfio device */
  66 #endif
  67         uint64_t timerfd_num;            /* for timerfd */
  68         char charbuf[16];                /* for others */
  69 };
  70
  71 TAILQ_HEAD(rte_intr_cb_list, rte_intr_callback);
  72 TAILQ_HEAD(rte_intr_source_list, rte_intr_source);
  73
  74 struct rte_intr_callback {
  75         TAILQ_ENTRY(rte_intr_callback) next;
  76         rte_intr_callback_fn cb_fn;  /**< callback address */
  77         void *cb_arg;                /**< parameter for callback */
  78 };
  79
  80 struct rte_intr_source {
  81         TAILQ_ENTRY(rte_intr_source) next;
  82         struct rte_intr_handle intr_handle; /**< interrupt handle */
  83         struct rte_intr_cb_list callbacks;  /**< user callbacks */
  84         uint32_t active;
  85 };
  86
  87 /* global spinlock for interrupt data operation */
  88 static rte_spinlock_t intr_lock = RTE_SPINLOCK_INITIALIZER;
  89
  90 /* union buffer for pipe read/write */
  91 static union intr_pipefds intr_pipe;
  92
  93 /* interrupt sources list */
  94 static struct rte_intr_source_list intr_sources;
  95
  96 /* interrupt handling thread */
  97 static pthread_t intr_thread;
  98
  99 /* VFIO interrupts */
 100 #ifdef VFIO_PRESENT
 101
 102 #define IRQ_SET_BUF_LEN  (sizeof(struct vfio_irq_set) + sizeof(int))
 103 /* irq set buffer length for queue interrupts and LSC interrupt */
 104 #define MSIX_IRQ_SET_BUF_LEN (sizeof(struct vfio_irq_set) + \
 105                               sizeof(int) * (RTE_MAX_RXTX_INTR_VEC_ID + 1))
 106
 107 /* enable legacy (INTx) interrupts */
 108 static int
 109 vfio_enable_intx(const struct rte_intr_handle *intr_handle) {
 110         struct vfio_irq_set *irq_set;
 111         char irq_set_buf[IRQ_SET_BUF_LEN];
 112         int len, ret;
 113         int *fd_ptr;
 114
 115         len = sizeof(irq_set_buf);
 116
 117         /* enable INTx */
 118         irq_set = (struct vfio_irq_set *) irq_set_buf;
 119         irq_set->argsz = len;
 120         irq_set->count = 1;
 121         irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
 122         irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
 123         irq_set->start = 0;
 124         fd_ptr = (int *) &irq_set->data;
 125         *fd_ptr = intr_handle->fd;
 126
 127         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 128
 129         if (ret) {
 130                 RTE_LOG(ERR, EAL, "Error enabling INTx interrupts for fd %d\n",
 131                                                 intr_handle->fd);
 132                 return -1;
 133         }
 134
 135         /* unmask INTx after enabling */
 136         memset(irq_set, 0, len);
 137         len = sizeof(struct vfio_irq_set);
 138         irq_set->argsz = len;
 139         irq_set->count = 1;
 140         irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK;
 141         irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
 142         irq_set->start = 0;
 143
 144         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 145
 146         if (ret) {
 147                 RTE_LOG(ERR, EAL, "Error unmasking INTx interrupts for fd %d\n",
 148                                                 intr_handle->fd);
 149                 return -1;
 150         }
 151         return 0;
 152 }
 153
 154 /* disable legacy (INTx) interrupts */
 155 static int
 156 vfio_disable_intx(const struct rte_intr_handle *intr_handle) {
 157         struct vfio_irq_set *irq_set;
 158         char irq_set_buf[IRQ_SET_BUF_LEN];
 159         int len, ret;
 160
 161         len = sizeof(struct vfio_irq_set);
 162
 163         /* mask interrupts before disabling */
 164         irq_set = (struct vfio_irq_set *) irq_set_buf;
 165         irq_set->argsz = len;
 166         irq_set->count = 1;
 167         irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK;
 168         irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
 169         irq_set->start = 0;
 170
 171         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 172
 173         if (ret) {
 174                 RTE_LOG(ERR, EAL, "Error masking INTx interrupts for fd %d\n",
 175                                                 intr_handle->fd);
 176                 return -1;
 177         }
 178
 179         /* disable INTx*/
 180         memset(irq_set, 0, len);
 181         irq_set->argsz = len;
 182         irq_set->count = 0;
 183         irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
 184         irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
 185         irq_set->start = 0;
 186
 187         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 188
 189         if (ret) {
 190                 RTE_LOG(ERR, EAL,
 191                         "Error disabling INTx interrupts for fd %d\n", intr_handle->fd);
 192                 return -1;
 193         }
 194         return 0;
 195 }
 196
 197 /* enable MSI interrupts */
 198 static int
 199 vfio_enable_msi(const struct rte_intr_handle *intr_handle) {
 200         int len, ret;
 201         char irq_set_buf[IRQ_SET_BUF_LEN];
 202         struct vfio_irq_set *irq_set;
 203         int *fd_ptr;
 204
 205         len = sizeof(irq_set_buf);
 206
 207         irq_set = (struct vfio_irq_set *) irq_set_buf;
 208         irq_set->argsz = len;
 209         irq_set->count = 1;
 210         irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
 211         irq_set->index = VFIO_PCI_MSI_IRQ_INDEX;
 212         irq_set->start = 0;
 213         fd_ptr = (int *) &irq_set->data;
 214         *fd_ptr = intr_handle->fd;
 215
 216         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 217
 218         if (ret) {
 219                 RTE_LOG(ERR, EAL, "Error enabling MSI interrupts for fd %d\n",
 220                                                 intr_handle->fd);
 221                 return -1;
 222         }
 223         return 0;
 224 }
 225
 226 /* disable MSI interrupts */
 227 static int
 228 vfio_disable_msi(const struct rte_intr_handle *intr_handle) {
 229         struct vfio_irq_set *irq_set;
 230         char irq_set_buf[IRQ_SET_BUF_LEN];
 231         int len, ret;
 232
 233         len = sizeof(struct vfio_irq_set);
 234
 235         irq_set = (struct vfio_irq_set *) irq_set_buf;
 236         irq_set->argsz = len;
 237         irq_set->count = 0;
 238         irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
 239         irq_set->index = VFIO_PCI_MSI_IRQ_INDEX;
 240         irq_set->start = 0;
 241
 242         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 243
 244         if (ret)
 245                 RTE_LOG(ERR, EAL,
 246                         "Error disabling MSI interrupts for fd %d\n", intr_handle->fd);
 247
 248         return ret;
 249 }
 250
 251 /* enable MSI-X interrupts */
 252 static int
 253 vfio_enable_msix(const struct rte_intr_handle *intr_handle) {
 254         int len, ret;
 255         char irq_set_buf[MSIX_IRQ_SET_BUF_LEN];
 256         struct vfio_irq_set *irq_set;
 257         int *fd_ptr;
 258
 259         len = sizeof(irq_set_buf);
 260
 261         irq_set = (struct vfio_irq_set *) irq_set_buf;
 262         irq_set->argsz = len;
 263         /* 0 < irq_set->count < RTE_MAX_RXTX_INTR_VEC_ID + 1 */
 264         irq_set->count = intr_handle->max_intr ?
 265                 (intr_handle->max_intr > RTE_MAX_RXTX_INTR_VEC_ID + 1 ?
 266                 RTE_MAX_RXTX_INTR_VEC_ID + 1 : intr_handle->max_intr) : 1;
 267         irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
 268         irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX;
 269         irq_set->start = 0;
 270         fd_ptr = (int *) &irq_set->data;
 271         /* INTR vector offset 0 reserve for non-efds mapping */
 272         fd_ptr[RTE_INTR_VEC_ZERO_OFFSET] = intr_handle->fd;
 273         memcpy(&fd_ptr[RTE_INTR_VEC_RXTX_OFFSET], intr_handle->efds,
 274                 sizeof(*intr_handle->efds) * intr_handle->nb_efd);
 275
 276         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 277
 278         if (ret) {
 279                 RTE_LOG(ERR, EAL, "Error enabling MSI-X interrupts for fd %d\n",
 280                                                 intr_handle->fd);
 281                 return -1;
 282         }
 283
 284         return 0;
 285 }
 286
 287 /* disable MSI-X interrupts */
 288 static int
 289 vfio_disable_msix(const struct rte_intr_handle *intr_handle) {
 290         struct vfio_irq_set *irq_set;
 291         char irq_set_buf[MSIX_IRQ_SET_BUF_LEN];
 292         int len, ret;
 293
 294         len = sizeof(struct vfio_irq_set);
 295
 296         irq_set = (struct vfio_irq_set *) irq_set_buf;
 297         irq_set->argsz = len;
 298         irq_set->count = 0;
 299         irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
 300         irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX;
 301         irq_set->start = 0;
 302
 303         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 304
 305         if (ret)
 306                 RTE_LOG(ERR, EAL,
 307                         "Error disabling MSI-X interrupts for fd %d\n", intr_handle->fd);
 308
 309         return ret;
 310 }
 311
 312 /* enable req notifier */
 313 static int
 314 vfio_enable_req(const struct rte_intr_handle *intr_handle)
 315 {
 316         int len, ret;
 317         char irq_set_buf[IRQ_SET_BUF_LEN];
 318         struct vfio_irq_set *irq_set;
 319         int *fd_ptr;
 320
 321         len = sizeof(irq_set_buf);
 322
 323         irq_set = (struct vfio_irq_set *) irq_set_buf;
 324         irq_set->argsz = len;
 325         irq_set->count = 1;
 326         irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
 327                          VFIO_IRQ_SET_ACTION_TRIGGER;
 328         irq_set->index = VFIO_PCI_REQ_IRQ_INDEX;
 329         irq_set->start = 0;
 330         fd_ptr = (int *) &irq_set->data;
 331         *fd_ptr = intr_handle->fd;
 332
 333         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 334
 335         if (ret) {
 336                 RTE_LOG(ERR, EAL, "Error enabling req interrupts for fd %d\n",
 337                                                 intr_handle->fd);
 338                 return -1;
 339         }
 340
 341         return 0;
 342 }
 343
 344 /* disable req notifier */
 345 static int
 346 vfio_disable_req(const struct rte_intr_handle *intr_handle)
 347 {
 348         struct vfio_irq_set *irq_set;
 349         char irq_set_buf[IRQ_SET_BUF_LEN];
 350         int len, ret;
 351
 352         len = sizeof(struct vfio_irq_set);
 353
 354         irq_set = (struct vfio_irq_set *) irq_set_buf;
 355         irq_set->argsz = len;
 356         irq_set->count = 0;
 357         irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
 358         irq_set->index = VFIO_PCI_REQ_IRQ_INDEX;
 359         irq_set->start = 0;
 360
 361         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 362
 363         if (ret)
 364                 RTE_LOG(ERR, EAL, "Error disabling req interrupts for fd %d\n",
 365                         intr_handle->fd);
 366
 367         return ret;
 368 }
 369 #endif
 370
 371 static int
 372 uio_intx_intr_disable(const struct rte_intr_handle *intr_handle)
 373 {
 374         unsigned char command_high;
 375
 376         /* use UIO config file descriptor for uio_pci_generic */
 377         if (pread(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
 378                 RTE_LOG(ERR, EAL,
 379                         "Error reading interrupts status for fd %d\n",
 380                         intr_handle->uio_cfg_fd);
 381                 return -1;
 382         }
 383         /* disable interrupts */
 384         command_high |= 0x4;
 385         if (pwrite(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
 386                 RTE_LOG(ERR, EAL,
 387                         "Error disabling interrupts for fd %d\n",
 388                         intr_handle->uio_cfg_fd);
 389                 return -1;
 390         }
 391
 392         return 0;
 393 }
 394
 395 static int
 396 uio_intx_intr_enable(const struct rte_intr_handle *intr_handle)
 397 {
 398         unsigned char command_high;
 399
 400         /* use UIO config file descriptor for uio_pci_generic */
 401         if (pread(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
 402                 RTE_LOG(ERR, EAL,
 403                         "Error reading interrupts status for fd %d\n",
 404                         intr_handle->uio_cfg_fd);
 405                 return -1;
 406         }
 407         /* enable interrupts */
 408         command_high &= ~0x4;
 409         if (pwrite(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
 410                 RTE_LOG(ERR, EAL,
 411                         "Error enabling interrupts for fd %d\n",
 412                         intr_handle->uio_cfg_fd);
 413                 return -1;
 414         }
 415
 416         return 0;
 417 }
 418
 419 static int
 420 uio_intr_disable(const struct rte_intr_handle *intr_handle)
 421 {
 422         const int value = 0;
 423
 424         if (write(intr_handle->fd, &value, sizeof(value)) < 0) {
 425                 RTE_LOG(ERR, EAL,
 426                         "Error disabling interrupts for fd %d (%s)\n",
 427                         intr_handle->fd, strerror(errno));
 428                 return -1;
 429         }
 430         return 0;
 431 }
 432
 433 static int
 434 uio_intr_enable(const struct rte_intr_handle *intr_handle)
 435 {
 436         const int value = 1;
 437
 438         if (write(intr_handle->fd, &value, sizeof(value)) < 0) {
 439                 RTE_LOG(ERR, EAL,
 440                         "Error enabling interrupts for fd %d (%s)\n",
 441                         intr_handle->fd, strerror(errno));
 442                 return -1;
 443         }
 444         return 0;
 445 }
 446
 447 int
 448 rte_intr_callback_register(const struct rte_intr_handle *intr_handle,
 449                         rte_intr_callback_fn cb, void *cb_arg)
 450 {
 451         int ret, wake_thread;
 452         struct rte_intr_source *src;
 453         struct rte_intr_callback *callback;
 454
 455         wake_thread = 0;
 456
 457         /* first do parameter checking */
 458         if (intr_handle == NULL || intr_handle->fd < 0 || cb == NULL) {
 459                 RTE_LOG(ERR, EAL,
 460                         "Registering with invalid input parameter\n");
 461                 return -EINVAL;
 462         }
 463
 464         /* allocate a new interrupt callback entity */
 465         callback = calloc(1, sizeof(*callback));
 466         if (callback == NULL) {
 467                 RTE_LOG(ERR, EAL, "Can not allocate memory\n");
 468                 return -ENOMEM;
 469         }
 470         callback->cb_fn = cb;
 471         callback->cb_arg = cb_arg;
 472
 473         rte_spinlock_lock(&intr_lock);
 474
 475         /* check if there is at least one callback registered for the fd */
 476         TAILQ_FOREACH(src, &intr_sources, next) {
 477                 if (src->intr_handle.fd == intr_handle->fd) {
 478                         /* we had no interrupts for this */
 479                         if (TAILQ_EMPTY(&src->callbacks))
 480                                 wake_thread = 1;
 481
 482                         TAILQ_INSERT_TAIL(&(src->callbacks), callback, next);
 483                         ret = 0;
 484                         break;
 485                 }
 486         }
 487
 488         /* no existing callbacks for this - add new source */
 489         if (src == NULL) {
 490                 src = calloc(1, sizeof(*src));
 491                 if (src == NULL) {
 492                         RTE_LOG(ERR, EAL, "Can not allocate memory\n");
 493                         free(callback);
 494                         ret = -ENOMEM;
 495                 } else {
 496                         src->intr_handle = *intr_handle;
 497                         TAILQ_INIT(&src->callbacks);
 498                         TAILQ_INSERT_TAIL(&(src->callbacks), callback, next);
 499                         TAILQ_INSERT_TAIL(&intr_sources, src, next);
 500                         wake_thread = 1;
 501                         ret = 0;
 502                 }
 503         }
 504
 505         rte_spinlock_unlock(&intr_lock);
 506
 507         /**
 508          * check if need to notify the pipe fd waited by epoll_wait to
 509          * rebuild the wait list.
 510          */
 511         if (wake_thread)
 512                 if (write(intr_pipe.writefd, "1", 1) < 0)
 513                         return -EPIPE;
 514
 515         return ret;
 516 }
 517
 518 int
 519 rte_intr_callback_unregister(const struct rte_intr_handle *intr_handle,
 520                         rte_intr_callback_fn cb_fn, void *cb_arg)
 521 {
 522         int ret;
 523         struct rte_intr_source *src;
 524         struct rte_intr_callback *cb, *next;
 525
 526         /* do parameter checking first */
 527         if (intr_handle == NULL || intr_handle->fd < 0) {
 528                 RTE_LOG(ERR, EAL,
 529                 "Unregistering with invalid input parameter\n");
 530                 return -EINVAL;
 531         }
 532
 533         rte_spinlock_lock(&intr_lock);
 534
 535         /* check if the insterrupt source for the fd is existent */
 536         TAILQ_FOREACH(src, &intr_sources, next)
 537                 if (src->intr_handle.fd == intr_handle->fd)
 538                         break;
 539
 540         /* No interrupt source registered for the fd */
 541         if (src == NULL) {
 542                 ret = -ENOENT;
 543
 544         /* interrupt source has some active callbacks right now. */
 545         } else if (src->active != 0) {
 546                 ret = -EAGAIN;
 547
 548         /* ok to remove. */
 549         } else {
 550                 ret = 0;
 551
 552                 /*walk through the callbacks and remove all that match. */
 553                 for (cb = TAILQ_FIRST(&src->callbacks); cb != NULL; cb = next) {
 554
 555                         next = TAILQ_NEXT(cb, next);
 556
 557                         if (cb->cb_fn == cb_fn && (cb_arg == (void *)-1 ||
 558                                         cb->cb_arg == cb_arg)) {
 559                                 TAILQ_REMOVE(&src->callbacks, cb, next);
 560                                 free(cb);
 561                                 ret++;
 562                         }
 563                 }
 564
 565                 /* all callbacks for that source are removed. */
 566                 if (TAILQ_EMPTY(&src->callbacks)) {
 567                         TAILQ_REMOVE(&intr_sources, src, next);
 568                         free(src);
 569                 }
 570         }
 571
 572         rte_spinlock_unlock(&intr_lock);
 573
 574         /* notify the pipe fd waited by epoll_wait to rebuild the wait list */
 575         if (ret >= 0 && write(intr_pipe.writefd, "1", 1) < 0) {
 576                 ret = -EPIPE;
 577         }
 578
 579         return ret;
 580 }
 581
 582 int
 583 rte_intr_enable(const struct rte_intr_handle *intr_handle)
 584 {
 585         if (intr_handle && intr_handle->type == RTE_INTR_HANDLE_VDEV)
 586                 return 0;
 587
 588         if (!intr_handle || intr_handle->fd < 0 || intr_handle->uio_cfg_fd < 0)
 589                 return -1;
 590
 591         switch (intr_handle->type){
 592         /* write to the uio fd to enable the interrupt */
 593         case RTE_INTR_HANDLE_UIO:
 594                 if (uio_intr_enable(intr_handle))
 595                         return -1;
 596                 break;
 597         case RTE_INTR_HANDLE_UIO_INTX:
 598                 if (uio_intx_intr_enable(intr_handle))
 599                         return -1;
 600                 break;
 601         /* not used at this moment */
 602         case RTE_INTR_HANDLE_ALARM:
 603                 return -1;
 604 #ifdef VFIO_PRESENT
 605         case RTE_INTR_HANDLE_VFIO_MSIX:
 606                 if (vfio_enable_msix(intr_handle))
 607                         return -1;
 608                 break;
 609         case RTE_INTR_HANDLE_VFIO_MSI:
 610                 if (vfio_enable_msi(intr_handle))
 611                         return -1;
 612                 break;
 613         case RTE_INTR_HANDLE_VFIO_LEGACY:
 614                 if (vfio_enable_intx(intr_handle))
 615                         return -1;
 616                 break;
 617         case RTE_INTR_HANDLE_VFIO_REQ:
 618                 if (vfio_enable_req(intr_handle))
 619                         return -1;
 620                 break;
 621 #endif
 622         /* not used at this moment */
 623         case RTE_INTR_HANDLE_DEV_EVENT:
 624                 return -1;
 625         /* unknown handle type */
 626         default:
 627                 RTE_LOG(ERR, EAL,
 628                         "Unknown handle type of fd %d\n",
 629                                         intr_handle->fd);
 630                 return -1;
 631         }
 632
 633         return 0;
 634 }
 635
 636 int
 637 rte_intr_disable(const struct rte_intr_handle *intr_handle)
 638 {
 639         if (intr_handle && intr_handle->type == RTE_INTR_HANDLE_VDEV)
 640                 return 0;
 641
 642         if (!intr_handle || intr_handle->fd < 0 || intr_handle->uio_cfg_fd < 0)
 643                 return -1;
 644
 645         switch (intr_handle->type){
 646         /* write to the uio fd to disable the interrupt */
 647         case RTE_INTR_HANDLE_UIO:
 648                 if (uio_intr_disable(intr_handle))
 649                         return -1;
 650                 break;
 651         case RTE_INTR_HANDLE_UIO_INTX:
 652                 if (uio_intx_intr_disable(intr_handle))
 653                         return -1;
 654                 break;
 655         /* not used at this moment */
 656         case RTE_INTR_HANDLE_ALARM:
 657                 return -1;
 658 #ifdef VFIO_PRESENT
 659         case RTE_INTR_HANDLE_VFIO_MSIX:
 660                 if (vfio_disable_msix(intr_handle))
 661                         return -1;
 662                 break;
 663         case RTE_INTR_HANDLE_VFIO_MSI:
 664                 if (vfio_disable_msi(intr_handle))
 665                         return -1;
 666                 break;
 667         case RTE_INTR_HANDLE_VFIO_LEGACY:
 668                 if (vfio_disable_intx(intr_handle))
 669                         return -1;
 670                 break;
 671         case RTE_INTR_HANDLE_VFIO_REQ:
 672                 if (vfio_disable_req(intr_handle))
 673                         return -1;
 674                 break;
 675
 676 #endif
 677         /* not used at this moment */
 678         case RTE_INTR_HANDLE_DEV_EVENT:
 679                 return -1;
 680         /* unknown handle type */
 681         default:
 682                 RTE_LOG(ERR, EAL,
 683                         "Unknown handle type of fd %d\n",
 684                                         intr_handle->fd);
 685                 return -1;
 686         }
 687
 688         return 0;
 689 }
 690
 691 static int
 692 eal_intr_process_interrupts(struct epoll_event *events, int nfds)
 693 {
 694         bool call = false;
 695         int n, bytes_read;
 696         struct rte_intr_source *src;
 697         struct rte_intr_callback *cb;
 698         union rte_intr_read_buffer buf;
 699         struct rte_intr_callback active_cb;
 700
 701         for (n = 0; n < nfds; n++) {
 702
 703                 /**
 704                  * if the pipe fd is ready to read, return out to
 705                  * rebuild the wait list.
 706                  */
 707                 if (events[n].data.fd == intr_pipe.readfd){
 708                         int r = read(intr_pipe.readfd, buf.charbuf,
 709                                         sizeof(buf.charbuf));
 710                         RTE_SET_USED(r);
 711                         return -1;
 712                 }
 713                 rte_spinlock_lock(&intr_lock);
 714                 TAILQ_FOREACH(src, &intr_sources, next)
 715                         if (src->intr_handle.fd ==
 716                                         events[n].data.fd)
 717                                 break;
 718                 if (src == NULL){
 719                         rte_spinlock_unlock(&intr_lock);
 720                         continue;
 721                 }
 722
 723                 /* mark this interrupt source as active and release the lock. */
 724                 src->active = 1;
 725                 rte_spinlock_unlock(&intr_lock);
 726
 727                 /* set the length to be read dor different handle type */
 728                 switch (src->intr_handle.type) {
 729                 case RTE_INTR_HANDLE_UIO:
 730                 case RTE_INTR_HANDLE_UIO_INTX:
 731                         bytes_read = sizeof(buf.uio_intr_count);
 732                         break;
 733                 case RTE_INTR_HANDLE_ALARM:
 734                         bytes_read = sizeof(buf.timerfd_num);
 735                         break;
 736 #ifdef VFIO_PRESENT
 737                 case RTE_INTR_HANDLE_VFIO_MSIX:
 738                 case RTE_INTR_HANDLE_VFIO_MSI:
 739                 case RTE_INTR_HANDLE_VFIO_LEGACY:
 740                         bytes_read = sizeof(buf.vfio_intr_count);
 741                         break;
 742 #endif
 743                 case RTE_INTR_HANDLE_VDEV:
 744                 case RTE_INTR_HANDLE_EXT:
 745                         bytes_read = 0;
 746                         call = true;
 747                         break;
 748                 case RTE_INTR_HANDLE_DEV_EVENT:
 749                         bytes_read = 0;
 750                         call = true;
 751                         break;
 752                 case RTE_INTR_HANDLE_VFIO_REQ:
 753                         bytes_read = 0;
 754                         call = true;
 755                         break;
 756                 default:
 757                         bytes_read = 1;
 758                         break;
 759                 }
 760
 761                 if (bytes_read > 0) {
 762                         /**
 763                          * read out to clear the ready-to-be-read flag
 764                          * for epoll_wait.
 765                          */
 766                         bytes_read = read(events[n].data.fd, &buf, bytes_read);
 767                         if (bytes_read < 0) {
 768                                 if (errno == EINTR || errno == EWOULDBLOCK)
 769                                         continue;
 770
 771                                 RTE_LOG(ERR, EAL, "Error reading from file "
 772                                         "descriptor %d: %s\n",
 773                                         events[n].data.fd,
 774                                         strerror(errno));
 775                         } else if (bytes_read == 0)
 776                                 RTE_LOG(ERR, EAL, "Read nothing from file "
 777                                         "descriptor %d\n", events[n].data.fd);
 778                         else
 779                                 call = true;
 780                 }
 781
 782                 /* grab a lock, again to call callbacks and update status. */
 783                 rte_spinlock_lock(&intr_lock);
 784
 785                 if (call) {
 786
 787                         /* Finally, call all callbacks. */
 788                         TAILQ_FOREACH(cb, &src->callbacks, next) {
 789
 790                                 /* make a copy and unlock. */
 791                                 active_cb = *cb;
 792                                 rte_spinlock_unlock(&intr_lock);
 793
 794                                 /* call the actual callback */
 795                                 active_cb.cb_fn(active_cb.cb_arg);
 796
 797                                 /*get the lock back. */
 798                                 rte_spinlock_lock(&intr_lock);
 799                         }
 800                 }
 801
 802                 /* we done with that interrupt source, release it. */
 803                 src->active = 0;
 804                 rte_spinlock_unlock(&intr_lock);
 805         }
 806
 807         return 0;
 808 }
 809
 810 /**
 811  * It handles all the interrupts.
 812  *
 813  * @param pfd
 814  *  epoll file descriptor.
 815  * @param totalfds
 816  *  The number of file descriptors added in epoll.
 817  *
 818  * @return
 819  *  void
 820  */
 821 static void
 822 eal_intr_handle_interrupts(int pfd, unsigned totalfds)
 823 {
 824         struct epoll_event events[totalfds];
 825         int nfds = 0;
 826
 827         for(;;) {
 828                 nfds = epoll_wait(pfd, events, totalfds,
 829                         EAL_INTR_EPOLL_WAIT_FOREVER);
 830                 /* epoll_wait fail */
 831                 if (nfds < 0) {
 832                         if (errno == EINTR)
 833                                 continue;
 834                         RTE_LOG(ERR, EAL,
 835                                 "epoll_wait returns with fail\n");
 836                         return;
 837                 }
 838                 /* epoll_wait timeout, will never happens here */
 839                 else if (nfds == 0)
 840                         continue;
 841                 /* epoll_wait has at least one fd ready to read */
 842                 if (eal_intr_process_interrupts(events, nfds) < 0)
 843                         return;
 844         }
 845 }
 846
 847 /**
 848  * It builds/rebuilds up the epoll file descriptor with all the
 849  * file descriptors being waited on. Then handles the interrupts.
 850  *
 851  * @param arg
 852  *  pointer. (unused)
 853  *
 854  * @return
 855  *  never return;
 856  */
 857 static __attribute__((noreturn)) void *
 858 eal_intr_thread_main(__rte_unused void *arg)
 859 {
 860         struct epoll_event ev;
 861
 862         /* host thread, never break out */
 863         for (;;) {
 864                 /* build up the epoll fd with all descriptors we are to
 865                  * wait on then pass it to the handle_interrupts function
 866                  */
 867                 static struct epoll_event pipe_event = {
 868                         .events = EPOLLIN | EPOLLPRI,
 869                 };
 870                 struct rte_intr_source *src;
 871                 unsigned numfds = 0;
 872
 873                 /* create epoll fd */
 874                 int pfd = epoll_create(1);
 875                 if (pfd < 0)
 876                         rte_panic("Cannot create epoll instance\n");
 877
 878                 pipe_event.data.fd = intr_pipe.readfd;
 879                 /**
 880                  * add pipe fd into wait list, this pipe is used to
 881                  * rebuild the wait list.
 882                  */
 883                 if (epoll_ctl(pfd, EPOLL_CTL_ADD, intr_pipe.readfd,
 884                                                 &pipe_event) < 0) {
 885                         rte_panic("Error adding fd to %d epoll_ctl, %s\n",
 886                                         intr_pipe.readfd, strerror(errno));
 887                 }
 888                 numfds++;
 889
 890                 rte_spinlock_lock(&intr_lock);
 891
 892                 TAILQ_FOREACH(src, &intr_sources, next) {
 893                         if (src->callbacks.tqh_first == NULL)
 894                                 continue; /* skip those with no callbacks */
 895                         ev.events = EPOLLIN | EPOLLPRI | EPOLLRDHUP | EPOLLHUP;
 896                         ev.data.fd = src->intr_handle.fd;
 897
 898                         /**
 899                          * add all the uio device file descriptor
 900                          * into wait list.
 901                          */
 902                         if (epoll_ctl(pfd, EPOLL_CTL_ADD,
 903                                         src->intr_handle.fd, &ev) < 0){
 904                                 rte_panic("Error adding fd %d epoll_ctl, %s\n",
 905                                         src->intr_handle.fd, strerror(errno));
 906                         }
 907                         else
 908                                 numfds++;
 909                 }
 910                 rte_spinlock_unlock(&intr_lock);
 911                 /* serve the interrupt */
 912                 eal_intr_handle_interrupts(pfd, numfds);
 913
 914                 /**
 915                  * when we return, we need to rebuild the
 916                  * list of fds to monitor.
 917                  */
 918                 close(pfd);
 919         }
 920 }
 921
 922 int
 923 rte_eal_intr_init(void)
 924 {
 925         int ret = 0;
 926
 927         /* init the global interrupt source head */
 928         TAILQ_INIT(&intr_sources);
 929
 930         /**
 931          * create a pipe which will be waited by epoll and notified to
 932          * rebuild the wait list of epoll.
 933          */
 934         if (pipe(intr_pipe.pipefd) < 0) {
 935                 rte_errno = errno;
 936                 return -1;
 937         }
 938
 939         /* create the host thread to wait/handle the interrupt */
 940         ret = rte_ctrl_thread_create(&intr_thread, "eal-intr-thread", NULL,
 941                         eal_intr_thread_main, NULL);
 942         if (ret != 0) {
 943                 rte_errno = -ret;
 944                 RTE_LOG(ERR, EAL,
 945                         "Failed to create thread for interrupt handling\n");
 946         }
 947
 948         return ret;
 949 }
 950
 951 static void
 952 eal_intr_proc_rxtx_intr(int fd, const struct rte_intr_handle *intr_handle)
 953 {
 954         union rte_intr_read_buffer buf;
 955         int bytes_read = 0;
 956         int nbytes;
 957
 958         switch (intr_handle->type) {
 959         case RTE_INTR_HANDLE_UIO:
 960         case RTE_INTR_HANDLE_UIO_INTX:
 961                 bytes_read = sizeof(buf.uio_intr_count);
 962                 break;
 963 #ifdef VFIO_PRESENT
 964         case RTE_INTR_HANDLE_VFIO_MSIX:
 965         case RTE_INTR_HANDLE_VFIO_MSI:
 966         case RTE_INTR_HANDLE_VFIO_LEGACY:
 967                 bytes_read = sizeof(buf.vfio_intr_count);
 968                 break;
 969 #endif
 970         case RTE_INTR_HANDLE_VDEV:
 971                 bytes_read = intr_handle->efd_counter_size;
 972                 /* For vdev, number of bytes to read is set by driver */
 973                 break;
 974         case RTE_INTR_HANDLE_EXT:
 975                 return;
 976         default:
 977                 bytes_read = 1;
 978                 RTE_LOG(INFO, EAL, "unexpected intr type\n");
 979                 break;
 980         }
 981
 982         /**
 983          * read out to clear the ready-to-be-read flag
 984          * for epoll_wait.
 985          */
 986         if (bytes_read == 0)
 987                 return;
 988         do {
 989                 nbytes = read(fd, &buf, bytes_read);
 990                 if (nbytes < 0) {
 991                         if (errno == EINTR || errno == EWOULDBLOCK ||
 992                             errno == EAGAIN)
 993                                 continue;
 994                         RTE_LOG(ERR, EAL,
 995                                 "Error reading from fd %d: %s\n",
 996                                 fd, strerror(errno));
 997                 } else if (nbytes == 0)
 998                         RTE_LOG(ERR, EAL, "Read nothing from fd %d\n", fd);
 999                 return;
1000         } while (1);
1001 }
1002
1003 static int
1004 eal_epoll_process_event(struct epoll_event *evs, unsigned int n,
1005                         struct rte_epoll_event *events)
1006 {
1007         unsigned int i, count = 0;
1008         struct rte_epoll_event *rev;
1009
1010         for (i = 0; i < n; i++) {
1011                 rev = evs[i].data.ptr;
1012                 if (!rev || !rte_atomic32_cmpset(&rev->status, RTE_EPOLL_VALID,
1013                                                  RTE_EPOLL_EXEC))
1014                         continue;
1015
1016                 events[count].status        = RTE_EPOLL_VALID;
1017                 events[count].fd            = rev->fd;
1018                 events[count].epfd          = rev->epfd;
1019                 events[count].epdata.event  = rev->epdata.event;
1020                 events[count].epdata.data   = rev->epdata.data;
1021                 if (rev->epdata.cb_fun)
1022                         rev->epdata.cb_fun(rev->fd,
1023                                            rev->epdata.cb_arg);
1024
1025                 rte_compiler_barrier();
1026                 rev->status = RTE_EPOLL_VALID;
1027                 count++;
1028         }
1029         return count;
1030 }
1031
1032 static inline int
1033 eal_init_tls_epfd(void)
1034 {
1035         int pfd = epoll_create(255);
1036
1037         if (pfd < 0) {
1038                 RTE_LOG(ERR, EAL,
1039                         "Cannot create epoll instance\n");
1040                 return -1;
1041         }
1042         return pfd;
1043 }
1044
1045 int
1046 rte_intr_tls_epfd(void)
1047 {
1048         if (RTE_PER_LCORE(_epfd) == -1)
1049                 RTE_PER_LCORE(_epfd) = eal_init_tls_epfd();
1050
1051         return RTE_PER_LCORE(_epfd);
1052 }
1053
1054 int
1055 rte_epoll_wait(int epfd, struct rte_epoll_event *events,
1056                int maxevents, int timeout)
1057 {
1058         struct epoll_event evs[maxevents];
1059         int rc;
1060
1061         if (!events) {
1062                 RTE_LOG(ERR, EAL, "rte_epoll_event can't be NULL\n");
1063                 return -1;
1064         }
1065
1066         /* using per thread epoll fd */
1067         if (epfd == RTE_EPOLL_PER_THREAD)
1068                 epfd = rte_intr_tls_epfd();
1069
1070         while (1) {
1071                 rc = epoll_wait(epfd, evs, maxevents, timeout);
1072                 if (likely(rc > 0)) {
1073                         /* epoll_wait has at least one fd ready to read */
1074                         rc = eal_epoll_process_event(evs, rc, events);
1075                         break;
1076                 } else if (rc < 0) {
1077                         if (errno == EINTR)
1078                                 continue;
1079                         /* epoll_wait fail */
1080                         RTE_LOG(ERR, EAL, "epoll_wait returns with fail %s\n",
1081                                 strerror(errno));
1082                         rc = -1;
1083                         break;
1084                 } else {
1085                         /* rc == 0, epoll_wait timed out */
1086                         break;
1087                 }
1088         }
1089
1090         return rc;
1091 }
1092
1093 static inline void
1094 eal_epoll_data_safe_free(struct rte_epoll_event *ev)
1095 {
1096         while (!rte_atomic32_cmpset(&ev->status, RTE_EPOLL_VALID,
1097                                     RTE_EPOLL_INVALID))
1098                 while (ev->status != RTE_EPOLL_VALID)
1099                         rte_pause();
1100         memset(&ev->epdata, 0, sizeof(ev->epdata));
1101         ev->fd = -1;
1102         ev->epfd = -1;
1103 }
1104
1105 int
1106 rte_epoll_ctl(int epfd, int op, int fd,
1107               struct rte_epoll_event *event)
1108 {
1109         struct epoll_event ev;
1110
1111         if (!event) {
1112                 RTE_LOG(ERR, EAL, "rte_epoll_event can't be NULL\n");
1113                 return -1;
1114         }
1115
1116         /* using per thread epoll fd */
1117         if (epfd == RTE_EPOLL_PER_THREAD)
1118                 epfd = rte_intr_tls_epfd();
1119
1120         if (op == EPOLL_CTL_ADD) {
1121                 event->status = RTE_EPOLL_VALID;
1122                 event->fd = fd;  /* ignore fd in event */
1123                 event->epfd = epfd;
1124                 ev.data.ptr = (void *)event;
1125         }
1126
1127         ev.events = event->epdata.event;
1128         if (epoll_ctl(epfd, op, fd, &ev) < 0) {
1129                 RTE_LOG(ERR, EAL, "Error op %d fd %d epoll_ctl, %s\n",
1130                         op, fd, strerror(errno));
1131                 if (op == EPOLL_CTL_ADD)
1132                         /* rollback status when CTL_ADD fail */
1133                         event->status = RTE_EPOLL_INVALID;
1134                 return -1;
1135         }
1136
1137         if (op == EPOLL_CTL_DEL && event->status != RTE_EPOLL_INVALID)
1138                 eal_epoll_data_safe_free(event);
1139
1140         return 0;
1141 }
1142
1143 int
1144 rte_intr_rx_ctl(struct rte_intr_handle *intr_handle, int epfd,
1145                 int op, unsigned int vec, void *data)
1146 {
1147         struct rte_epoll_event *rev;
1148         struct rte_epoll_data *epdata;
1149         int epfd_op;
1150         unsigned int efd_idx;
1151         int rc = 0;
1152
1153         efd_idx = (vec >= RTE_INTR_VEC_RXTX_OFFSET) ?
1154                 (vec - RTE_INTR_VEC_RXTX_OFFSET) : vec;
1155
1156         if (!intr_handle || intr_handle->nb_efd == 0 ||
1157             efd_idx >= intr_handle->nb_efd) {
1158                 RTE_LOG(ERR, EAL, "Wrong intr vector number.\n");
1159                 return -EPERM;
1160         }
1161
1162         switch (op) {
1163         case RTE_INTR_EVENT_ADD:
1164                 epfd_op = EPOLL_CTL_ADD;
1165                 rev = &intr_handle->elist[efd_idx];
1166                 if (rev->status != RTE_EPOLL_INVALID) {
1167                         RTE_LOG(INFO, EAL, "Event already been added.\n");
1168                         return -EEXIST;
1169                 }
1170
1171                 /* attach to intr vector fd */
1172                 epdata = &rev->epdata;
1173                 epdata->event  = EPOLLIN | EPOLLPRI | EPOLLET;
1174                 epdata->data   = data;
1175                 epdata->cb_fun = (rte_intr_event_cb_t)eal_intr_proc_rxtx_intr;
1176                 epdata->cb_arg = (void *)intr_handle;
1177                 rc = rte_epoll_ctl(epfd, epfd_op,
1178                                    intr_handle->efds[efd_idx], rev);
1179                 if (!rc)
1180                         RTE_LOG(DEBUG, EAL,
1181                                 "efd %d associated with vec %d added on epfd %d"
1182                                 "\n", rev->fd, vec, epfd);
1183                 else
1184                         rc = -EPERM;
1185                 break;
1186         case RTE_INTR_EVENT_DEL:
1187                 epfd_op = EPOLL_CTL_DEL;
1188                 rev = &intr_handle->elist[efd_idx];
1189                 if (rev->status == RTE_EPOLL_INVALID) {
1190                         RTE_LOG(INFO, EAL, "Event does not exist.\n");
1191                         return -EPERM;
1192                 }
1193
1194                 rc = rte_epoll_ctl(rev->epfd, epfd_op, rev->fd, rev);
1195                 if (rc)
1196                         rc = -EPERM;
1197                 break;
1198         default:
1199                 RTE_LOG(ERR, EAL, "event op type mismatch\n");
1200                 rc = -EPERM;
1201         }
1202
1203         return rc;
1204 }
1205
1206 void
1207 rte_intr_free_epoll_fd(struct rte_intr_handle *intr_handle)
1208 {
1209         uint32_t i;
1210         struct rte_epoll_event *rev;
1211
1212         for (i = 0; i < intr_handle->nb_efd; i++) {
1213                 rev = &intr_handle->elist[i];
1214                 if (rev->status == RTE_EPOLL_INVALID)
1215                         continue;
1216                 if (rte_epoll_ctl(rev->epfd, EPOLL_CTL_DEL, rev->fd, rev)) {
1217                         /* force free if the entry valid */
1218                         eal_epoll_data_safe_free(rev);
1219                         rev->status = RTE_EPOLL_INVALID;
1220                 }
1221         }
1222 }
1223
1224 int
1225 rte_intr_efd_enable(struct rte_intr_handle *intr_handle, uint32_t nb_efd)
1226 {
1227         uint32_t i;
1228         int fd;
1229         uint32_t n = RTE_MIN(nb_efd, (uint32_t)RTE_MAX_RXTX_INTR_VEC_ID);
1230
1231         assert(nb_efd != 0);
1232
1233         if (intr_handle->type == RTE_INTR_HANDLE_VFIO_MSIX) {
1234                 for (i = 0; i < n; i++) {
1235                         fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
1236                         if (fd < 0) {
1237                                 RTE_LOG(ERR, EAL,
1238                                         "can't setup eventfd, error %i (%s)\n",
1239                                         errno, strerror(errno));
1240                                 return -errno;
1241                         }
1242                         intr_handle->efds[i] = fd;
1243                 }
1244                 intr_handle->nb_efd   = n;
1245                 intr_handle->max_intr = NB_OTHER_INTR + n;
1246         } else if (intr_handle->type == RTE_INTR_HANDLE_VDEV) {
1247                 /* only check, initialization would be done in vdev driver.*/
1248                 if (intr_handle->efd_counter_size >
1249                     sizeof(union rte_intr_read_buffer)) {
1250                         RTE_LOG(ERR, EAL, "the efd_counter_size is oversized");
1251                         return -EINVAL;
1252                 }
1253         } else {
1254                 intr_handle->efds[0]  = intr_handle->fd;
1255                 intr_handle->nb_efd   = RTE_MIN(nb_efd, 1U);
1256                 intr_handle->max_intr = NB_OTHER_INTR;
1257         }
1258
1259         return 0;
1260 }
1261
1262 void
1263 rte_intr_efd_disable(struct rte_intr_handle *intr_handle)
1264 {
1265         uint32_t i;
1266
1267         rte_intr_free_epoll_fd(intr_handle);
1268         if (intr_handle->max_intr > intr_handle->nb_efd) {
1269                 for (i = 0; i < intr_handle->nb_efd; i++)
1270                         close(intr_handle->efds[i]);
1271         }
1272         intr_handle->nb_efd = 0;
1273         intr_handle->max_intr = 0;
1274 }
1275
1276 int
1277 rte_intr_dp_is_en(struct rte_intr_handle *intr_handle)
1278 {
1279         return !(!intr_handle->nb_efd);
1280 }
1281
1282 int
1283 rte_intr_allow_others(struct rte_intr_handle *intr_handle)
1284 {
1285         if (!rte_intr_dp_is_en(intr_handle))
1286                 return 1;
1287         else
1288                 return !!(intr_handle->max_intr - intr_handle->nb_efd);
1289 }
1290
1291 int
1292 rte_intr_cap_multiple(struct rte_intr_handle *intr_handle)
1293 {
1294         if (intr_handle->type == RTE_INTR_HANDLE_VFIO_MSIX)
1295                 return 1;
1296
1297         if (intr_handle->type == RTE_INTR_HANDLE_VDEV)
1298                 return 1;
1299
1300         return 0;
1301 }