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 #include <rte_vfio.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 };
  80
  81 struct rte_intr_source {
  82         TAILQ_ENTRY(rte_intr_source) next;
  83         struct rte_intr_handle intr_handle; /**< interrupt handle */
  84         struct rte_intr_cb_list callbacks;  /**< user callbacks */
  85         uint32_t active;
  86 };
  87
  88 /* global spinlock for interrupt data operation */
  89 static rte_spinlock_t intr_lock = RTE_SPINLOCK_INITIALIZER;
  90
  91 /* union buffer for pipe read/write */
  92 static union intr_pipefds intr_pipe;
  93
  94 /* interrupt sources list */
  95 static struct rte_intr_source_list intr_sources;
  96
  97 /* interrupt handling thread */
  98 static pthread_t intr_thread;
  99
 100 /* VFIO interrupts */
 101 #ifdef VFIO_PRESENT
 102
 103 #define IRQ_SET_BUF_LEN  (sizeof(struct vfio_irq_set) + sizeof(int))
 104 /* irq set buffer length for queue interrupts and LSC interrupt */
 105 #define MSIX_IRQ_SET_BUF_LEN (sizeof(struct vfio_irq_set) + \
 106                               sizeof(int) * (RTE_MAX_RXTX_INTR_VEC_ID + 1))
 107
 108 /* enable legacy (INTx) interrupts */
 109 static int
 110 vfio_enable_intx(const struct rte_intr_handle *intr_handle) {
 111         struct vfio_irq_set *irq_set;
 112         char irq_set_buf[IRQ_SET_BUF_LEN];
 113         int len, ret;
 114         int *fd_ptr;
 115
 116         len = sizeof(irq_set_buf);
 117
 118         /* enable INTx */
 119         irq_set = (struct vfio_irq_set *) irq_set_buf;
 120         irq_set->argsz = len;
 121         irq_set->count = 1;
 122         irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
 123         irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
 124         irq_set->start = 0;
 125         fd_ptr = (int *) &irq_set->data;
 126         *fd_ptr = intr_handle->fd;
 127
 128         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 129
 130         if (ret) {
 131                 RTE_LOG(ERR, EAL, "Error enabling INTx interrupts for fd %d\n",
 132                                                 intr_handle->fd);
 133                 return -1;
 134         }
 135
 136         /* unmask INTx after enabling */
 137         memset(irq_set, 0, len);
 138         len = sizeof(struct vfio_irq_set);
 139         irq_set->argsz = len;
 140         irq_set->count = 1;
 141         irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK;
 142         irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
 143         irq_set->start = 0;
 144
 145         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 146
 147         if (ret) {
 148                 RTE_LOG(ERR, EAL, "Error unmasking INTx interrupts for fd %d\n",
 149                                                 intr_handle->fd);
 150                 return -1;
 151         }
 152         return 0;
 153 }
 154
 155 /* disable legacy (INTx) interrupts */
 156 static int
 157 vfio_disable_intx(const struct rte_intr_handle *intr_handle) {
 158         struct vfio_irq_set *irq_set;
 159         char irq_set_buf[IRQ_SET_BUF_LEN];
 160         int len, ret;
 161
 162         len = sizeof(struct vfio_irq_set);
 163
 164         /* mask interrupts before disabling */
 165         irq_set = (struct vfio_irq_set *) irq_set_buf;
 166         irq_set->argsz = len;
 167         irq_set->count = 1;
 168         irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK;
 169         irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
 170         irq_set->start = 0;
 171
 172         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 173
 174         if (ret) {
 175                 RTE_LOG(ERR, EAL, "Error masking INTx interrupts for fd %d\n",
 176                                                 intr_handle->fd);
 177                 return -1;
 178         }
 179
 180         /* disable INTx*/
 181         memset(irq_set, 0, len);
 182         irq_set->argsz = len;
 183         irq_set->count = 0;
 184         irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
 185         irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
 186         irq_set->start = 0;
 187
 188         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 189
 190         if (ret) {
 191                 RTE_LOG(ERR, EAL,
 192                         "Error disabling INTx interrupts for fd %d\n", intr_handle->fd);
 193                 return -1;
 194         }
 195         return 0;
 196 }
 197
 198 /* enable MSI interrupts */
 199 static int
 200 vfio_enable_msi(const struct rte_intr_handle *intr_handle) {
 201         int len, ret;
 202         char irq_set_buf[IRQ_SET_BUF_LEN];
 203         struct vfio_irq_set *irq_set;
 204         int *fd_ptr;
 205
 206         len = sizeof(irq_set_buf);
 207
 208         irq_set = (struct vfio_irq_set *) irq_set_buf;
 209         irq_set->argsz = len;
 210         irq_set->count = 1;
 211         irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
 212         irq_set->index = VFIO_PCI_MSI_IRQ_INDEX;
 213         irq_set->start = 0;
 214         fd_ptr = (int *) &irq_set->data;
 215         *fd_ptr = intr_handle->fd;
 216
 217         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 218
 219         if (ret) {
 220                 RTE_LOG(ERR, EAL, "Error enabling MSI interrupts for fd %d\n",
 221                                                 intr_handle->fd);
 222                 return -1;
 223         }
 224         return 0;
 225 }
 226
 227 /* disable MSI interrupts */
 228 static int
 229 vfio_disable_msi(const struct rte_intr_handle *intr_handle) {
 230         struct vfio_irq_set *irq_set;
 231         char irq_set_buf[IRQ_SET_BUF_LEN];
 232         int len, ret;
 233
 234         len = sizeof(struct vfio_irq_set);
 235
 236         irq_set = (struct vfio_irq_set *) irq_set_buf;
 237         irq_set->argsz = len;
 238         irq_set->count = 0;
 239         irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
 240         irq_set->index = VFIO_PCI_MSI_IRQ_INDEX;
 241         irq_set->start = 0;
 242
 243         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 244
 245         if (ret)
 246                 RTE_LOG(ERR, EAL,
 247                         "Error disabling MSI interrupts for fd %d\n", intr_handle->fd);
 248
 249         return ret;
 250 }
 251
 252 /* enable MSI-X interrupts */
 253 static int
 254 vfio_enable_msix(const struct rte_intr_handle *intr_handle) {
 255         int len, ret;
 256         char irq_set_buf[MSIX_IRQ_SET_BUF_LEN];
 257         struct vfio_irq_set *irq_set;
 258         int *fd_ptr;
 259
 260         len = sizeof(irq_set_buf);
 261
 262         irq_set = (struct vfio_irq_set *) irq_set_buf;
 263         irq_set->argsz = len;
 264         /* 0 < irq_set->count < RTE_MAX_RXTX_INTR_VEC_ID + 1 */
 265         irq_set->count = intr_handle->max_intr ?
 266                 (intr_handle->max_intr > RTE_MAX_RXTX_INTR_VEC_ID + 1 ?
 267                 RTE_MAX_RXTX_INTR_VEC_ID + 1 : intr_handle->max_intr) : 1;
 268         irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
 269         irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX;
 270         irq_set->start = 0;
 271         fd_ptr = (int *) &irq_set->data;
 272         /* INTR vector offset 0 reserve for non-efds mapping */
 273         fd_ptr[RTE_INTR_VEC_ZERO_OFFSET] = intr_handle->fd;
 274         memcpy(&fd_ptr[RTE_INTR_VEC_RXTX_OFFSET], intr_handle->efds,
 275                 sizeof(*intr_handle->efds) * intr_handle->nb_efd);
 276
 277         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 278
 279         if (ret) {
 280                 RTE_LOG(ERR, EAL, "Error enabling MSI-X interrupts for fd %d\n",
 281                                                 intr_handle->fd);
 282                 return -1;
 283         }
 284
 285         return 0;
 286 }
 287
 288 /* disable MSI-X interrupts */
 289 static int
 290 vfio_disable_msix(const struct rte_intr_handle *intr_handle) {
 291         struct vfio_irq_set *irq_set;
 292         char irq_set_buf[MSIX_IRQ_SET_BUF_LEN];
 293         int len, ret;
 294
 295         len = sizeof(struct vfio_irq_set);
 296
 297         irq_set = (struct vfio_irq_set *) irq_set_buf;
 298         irq_set->argsz = len;
 299         irq_set->count = 0;
 300         irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
 301         irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX;
 302         irq_set->start = 0;
 303
 304         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 305
 306         if (ret)
 307                 RTE_LOG(ERR, EAL,
 308                         "Error disabling MSI-X interrupts for fd %d\n", intr_handle->fd);
 309
 310         return ret;
 311 }
 312
 313 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
 314 /* enable req notifier */
 315 static int
 316 vfio_enable_req(const struct rte_intr_handle *intr_handle)
 317 {
 318         int len, ret;
 319         char irq_set_buf[IRQ_SET_BUF_LEN];
 320         struct vfio_irq_set *irq_set;
 321         int *fd_ptr;
 322
 323         len = sizeof(irq_set_buf);
 324
 325         irq_set = (struct vfio_irq_set *) irq_set_buf;
 326         irq_set->argsz = len;
 327         irq_set->count = 1;
 328         irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
 329                          VFIO_IRQ_SET_ACTION_TRIGGER;
 330         irq_set->index = VFIO_PCI_REQ_IRQ_INDEX;
 331         irq_set->start = 0;
 332         fd_ptr = (int *) &irq_set->data;
 333         *fd_ptr = intr_handle->fd;
 334
 335         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 336
 337         if (ret) {
 338                 RTE_LOG(ERR, EAL, "Error enabling req interrupts for fd %d\n",
 339                                                 intr_handle->fd);
 340                 return -1;
 341         }
 342
 343         return 0;
 344 }
 345
 346 /* disable req notifier */
 347 static int
 348 vfio_disable_req(const struct rte_intr_handle *intr_handle)
 349 {
 350         struct vfio_irq_set *irq_set;
 351         char irq_set_buf[IRQ_SET_BUF_LEN];
 352         int len, ret;
 353
 354         len = sizeof(struct vfio_irq_set);
 355
 356         irq_set = (struct vfio_irq_set *) irq_set_buf;
 357         irq_set->argsz = len;
 358         irq_set->count = 0;
 359         irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
 360         irq_set->index = VFIO_PCI_REQ_IRQ_INDEX;
 361         irq_set->start = 0;
 362
 363         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 364
 365         if (ret)
 366                 RTE_LOG(ERR, EAL, "Error disabling req interrupts for fd %d\n",
 367                         intr_handle->fd);
 368
 369         return ret;
 370 }
 371 #endif
 372 #endif
 373
 374 static int
 375 uio_intx_intr_disable(const struct rte_intr_handle *intr_handle)
 376 {
 377         unsigned char command_high;
 378
 379         /* use UIO config file descriptor for uio_pci_generic */
 380         if (pread(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
 381                 RTE_LOG(ERR, EAL,
 382                         "Error reading interrupts status for fd %d\n",
 383                         intr_handle->uio_cfg_fd);
 384                 return -1;
 385         }
 386         /* disable interrupts */
 387         command_high |= 0x4;
 388         if (pwrite(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
 389                 RTE_LOG(ERR, EAL,
 390                         "Error disabling interrupts for fd %d\n",
 391                         intr_handle->uio_cfg_fd);
 392                 return -1;
 393         }
 394
 395         return 0;
 396 }
 397
 398 static int
 399 uio_intx_intr_enable(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         /* enable 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 enabling interrupts for fd %d\n",
 415                         intr_handle->uio_cfg_fd);
 416                 return -1;
 417         }
 418
 419         return 0;
 420 }
 421
 422 static int
 423 uio_intr_disable(const struct rte_intr_handle *intr_handle)
 424 {
 425         const int value = 0;
 426
 427         if (write(intr_handle->fd, &value, sizeof(value)) < 0) {
 428                 RTE_LOG(ERR, EAL,
 429                         "Error disabling interrupts for fd %d (%s)\n",
 430                         intr_handle->fd, strerror(errno));
 431                 return -1;
 432         }
 433         return 0;
 434 }
 435
 436 static int
 437 uio_intr_enable(const struct rte_intr_handle *intr_handle)
 438 {
 439         const int value = 1;
 440
 441         if (write(intr_handle->fd, &value, sizeof(value)) < 0) {
 442                 RTE_LOG(ERR, EAL,
 443                         "Error enabling interrupts for fd %d (%s)\n",
 444                         intr_handle->fd, strerror(errno));
 445                 return -1;
 446         }
 447         return 0;
 448 }
 449
 450 int
 451 rte_intr_callback_register(const struct rte_intr_handle *intr_handle,
 452                         rte_intr_callback_fn cb, void *cb_arg)
 453 {
 454         int ret, wake_thread;
 455         struct rte_intr_source *src;
 456         struct rte_intr_callback *callback;
 457
 458         wake_thread = 0;
 459
 460         /* first do parameter checking */
 461         if (intr_handle == NULL || intr_handle->fd < 0 || cb == NULL) {
 462                 RTE_LOG(ERR, EAL,
 463                         "Registering with invalid input parameter\n");
 464                 return -EINVAL;
 465         }
 466
 467         /* allocate a new interrupt callback entity */
 468         callback = calloc(1, sizeof(*callback));
 469         if (callback == NULL) {
 470                 RTE_LOG(ERR, EAL, "Can not allocate memory\n");
 471                 return -ENOMEM;
 472         }
 473         callback->cb_fn = cb;
 474         callback->cb_arg = cb_arg;
 475
 476         rte_spinlock_lock(&intr_lock);
 477
 478         /* check if there is at least one callback registered for the fd */
 479         TAILQ_FOREACH(src, &intr_sources, next) {
 480                 if (src->intr_handle.fd == intr_handle->fd) {
 481                         /* we had no interrupts for this */
 482                         if (TAILQ_EMPTY(&src->callbacks))
 483                                 wake_thread = 1;
 484
 485                         TAILQ_INSERT_TAIL(&(src->callbacks), callback, next);
 486                         ret = 0;
 487                         break;
 488                 }
 489         }
 490
 491         /* no existing callbacks for this - add new source */
 492         if (src == NULL) {
 493                 src = calloc(1, sizeof(*src));
 494                 if (src == NULL) {
 495                         RTE_LOG(ERR, EAL, "Can not allocate memory\n");
 496                         free(callback);
 497                         ret = -ENOMEM;
 498                 } else {
 499                         src->intr_handle = *intr_handle;
 500                         TAILQ_INIT(&src->callbacks);
 501                         TAILQ_INSERT_TAIL(&(src->callbacks), callback, next);
 502                         TAILQ_INSERT_TAIL(&intr_sources, src, next);
 503                         wake_thread = 1;
 504                         ret = 0;
 505                 }
 506         }
 507
 508         rte_spinlock_unlock(&intr_lock);
 509
 510         /**
 511          * check if need to notify the pipe fd waited by epoll_wait to
 512          * rebuild the wait list.
 513          */
 514         if (wake_thread)
 515                 if (write(intr_pipe.writefd, "1", 1) < 0)
 516                         return -EPIPE;
 517
 518         return ret;
 519 }
 520
 521 int
 522 rte_intr_callback_unregister(const struct rte_intr_handle *intr_handle,
 523                         rte_intr_callback_fn cb_fn, void *cb_arg)
 524 {
 525         int ret;
 526         struct rte_intr_source *src;
 527         struct rte_intr_callback *cb, *next;
 528
 529         /* do parameter checking first */
 530         if (intr_handle == NULL || intr_handle->fd < 0) {
 531                 RTE_LOG(ERR, EAL,
 532                 "Unregistering with invalid input parameter\n");
 533                 return -EINVAL;
 534         }
 535
 536         rte_spinlock_lock(&intr_lock);
 537
 538         /* check if the insterrupt source for the fd is existent */
 539         TAILQ_FOREACH(src, &intr_sources, next)
 540                 if (src->intr_handle.fd == intr_handle->fd)
 541                         break;
 542
 543         /* No interrupt source registered for the fd */
 544         if (src == NULL) {
 545                 ret = -ENOENT;
 546
 547         /* interrupt source has some active callbacks right now. */
 548         } else if (src->active != 0) {
 549                 ret = -EAGAIN;
 550
 551         /* ok to remove. */
 552         } else {
 553                 ret = 0;
 554
 555                 /*walk through the callbacks and remove all that match. */
 556                 for (cb = TAILQ_FIRST(&src->callbacks); cb != NULL; cb = next) {
 557
 558                         next = TAILQ_NEXT(cb, next);
 559
 560                         if (cb->cb_fn == cb_fn && (cb_arg == (void *)-1 ||
 561                                         cb->cb_arg == cb_arg)) {
 562                                 TAILQ_REMOVE(&src->callbacks, cb, next);
 563                                 free(cb);
 564                                 ret++;
 565                         }
 566                 }
 567
 568                 /* all callbacks for that source are removed. */
 569                 if (TAILQ_EMPTY(&src->callbacks)) {
 570                         TAILQ_REMOVE(&intr_sources, src, next);
 571                         free(src);
 572                 }
 573         }
 574
 575         rte_spinlock_unlock(&intr_lock);
 576
 577         /* notify the pipe fd waited by epoll_wait to rebuild the wait list */
 578         if (ret >= 0 && write(intr_pipe.writefd, "1", 1) < 0) {
 579                 ret = -EPIPE;
 580         }
 581
 582         return ret;
 583 }
 584
 585 int
 586 rte_intr_enable(const struct rte_intr_handle *intr_handle)
 587 {
 588         if (intr_handle && intr_handle->type == RTE_INTR_HANDLE_VDEV)
 589                 return 0;
 590
 591         if (!intr_handle || intr_handle->fd < 0 || intr_handle->uio_cfg_fd < 0)
 592                 return -1;
 593
 594         switch (intr_handle->type){
 595         /* write to the uio fd to enable the interrupt */
 596         case RTE_INTR_HANDLE_UIO:
 597                 if (uio_intr_enable(intr_handle))
 598                         return -1;
 599                 break;
 600         case RTE_INTR_HANDLE_UIO_INTX:
 601                 if (uio_intx_intr_enable(intr_handle))
 602                         return -1;
 603                 break;
 604         /* not used at this moment */
 605         case RTE_INTR_HANDLE_ALARM:
 606                 return -1;
 607 #ifdef VFIO_PRESENT
 608         case RTE_INTR_HANDLE_VFIO_MSIX:
 609                 if (vfio_enable_msix(intr_handle))
 610                         return -1;
 611                 break;
 612         case RTE_INTR_HANDLE_VFIO_MSI:
 613                 if (vfio_enable_msi(intr_handle))
 614                         return -1;
 615                 break;
 616         case RTE_INTR_HANDLE_VFIO_LEGACY:
 617                 if (vfio_enable_intx(intr_handle))
 618                         return -1;
 619                 break;
 620 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
 621         case RTE_INTR_HANDLE_VFIO_REQ:
 622                 if (vfio_enable_req(intr_handle))
 623                         return -1;
 624                 break;
 625 #endif
 626 #endif
 627         /* not used at this moment */
 628         case RTE_INTR_HANDLE_DEV_EVENT:
 629                 return -1;
 630         /* unknown handle type */
 631         default:
 632                 RTE_LOG(ERR, EAL,
 633                         "Unknown handle type of fd %d\n",
 634                                         intr_handle->fd);
 635                 return -1;
 636         }
 637
 638         return 0;
 639 }
 640
 641 int
 642 rte_intr_disable(const struct rte_intr_handle *intr_handle)
 643 {
 644         if (intr_handle && intr_handle->type == RTE_INTR_HANDLE_VDEV)
 645                 return 0;
 646
 647         if (!intr_handle || intr_handle->fd < 0 || intr_handle->uio_cfg_fd < 0)
 648                 return -1;
 649
 650         switch (intr_handle->type){
 651         /* write to the uio fd to disable the interrupt */
 652         case RTE_INTR_HANDLE_UIO:
 653                 if (uio_intr_disable(intr_handle))
 654                         return -1;
 655                 break;
 656         case RTE_INTR_HANDLE_UIO_INTX:
 657                 if (uio_intx_intr_disable(intr_handle))
 658                         return -1;
 659                 break;
 660         /* not used at this moment */
 661         case RTE_INTR_HANDLE_ALARM:
 662                 return -1;
 663 #ifdef VFIO_PRESENT
 664         case RTE_INTR_HANDLE_VFIO_MSIX:
 665                 if (vfio_disable_msix(intr_handle))
 666                         return -1;
 667                 break;
 668         case RTE_INTR_HANDLE_VFIO_MSI:
 669                 if (vfio_disable_msi(intr_handle))
 670                         return -1;
 671                 break;
 672         case RTE_INTR_HANDLE_VFIO_LEGACY:
 673                 if (vfio_disable_intx(intr_handle))
 674                         return -1;
 675                 break;
 676 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
 677         case RTE_INTR_HANDLE_VFIO_REQ:
 678                 if (vfio_disable_req(intr_handle))
 679                         return -1;
 680                 break;
 681 #endif
 682 #endif
 683         /* not used at this moment */
 684         case RTE_INTR_HANDLE_DEV_EVENT:
 685                 return -1;
 686         /* unknown handle type */
 687         default:
 688                 RTE_LOG(ERR, EAL,
 689                         "Unknown handle type of fd %d\n",
 690                                         intr_handle->fd);
 691                 return -1;
 692         }
 693
 694         return 0;
 695 }
 696
 697 static int
 698 eal_intr_process_interrupts(struct epoll_event *events, int nfds)
 699 {
 700         bool call = false;
 701         int n, bytes_read;
 702         struct rte_intr_source *src;
 703         struct rte_intr_callback *cb;
 704         union rte_intr_read_buffer buf;
 705         struct rte_intr_callback active_cb;
 706
 707         for (n = 0; n < nfds; n++) {
 708
 709                 /**
 710                  * if the pipe fd is ready to read, return out to
 711                  * rebuild the wait list.
 712                  */
 713                 if (events[n].data.fd == intr_pipe.readfd){
 714                         int r = read(intr_pipe.readfd, buf.charbuf,
 715                                         sizeof(buf.charbuf));
 716                         RTE_SET_USED(r);
 717                         return -1;
 718                 }
 719                 rte_spinlock_lock(&intr_lock);
 720                 TAILQ_FOREACH(src, &intr_sources, next)
 721                         if (src->intr_handle.fd ==
 722                                         events[n].data.fd)
 723                                 break;
 724                 if (src == NULL){
 725                         rte_spinlock_unlock(&intr_lock);
 726                         continue;
 727                 }
 728
 729                 /* mark this interrupt source as active and release the lock. */
 730                 src->active = 1;
 731                 rte_spinlock_unlock(&intr_lock);
 732
 733                 /* set the length to be read dor different handle type */
 734                 switch (src->intr_handle.type) {
 735                 case RTE_INTR_HANDLE_UIO:
 736                 case RTE_INTR_HANDLE_UIO_INTX:
 737                         bytes_read = sizeof(buf.uio_intr_count);
 738                         break;
 739                 case RTE_INTR_HANDLE_ALARM:
 740                         bytes_read = sizeof(buf.timerfd_num);
 741                         break;
 742 #ifdef VFIO_PRESENT
 743                 case RTE_INTR_HANDLE_VFIO_MSIX:
 744                 case RTE_INTR_HANDLE_VFIO_MSI:
 745                 case RTE_INTR_HANDLE_VFIO_LEGACY:
 746                         bytes_read = sizeof(buf.vfio_intr_count);
 747                         break;
 748 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
 749                 case RTE_INTR_HANDLE_VFIO_REQ:
 750                         bytes_read = 0;
 751                         call = true;
 752                         break;
 753 #endif
 754 #endif
 755                 case RTE_INTR_HANDLE_VDEV:
 756                 case RTE_INTR_HANDLE_EXT:
 757                         bytes_read = 0;
 758                         call = true;
 759                         break;
 760                 case RTE_INTR_HANDLE_DEV_EVENT:
 761                         bytes_read = 0;
 762                         call = true;
 763                         break;
 764                 default:
 765                         bytes_read = 1;
 766                         break;
 767                 }
 768
 769                 if (bytes_read > 0) {
 770                         /**
 771                          * read out to clear the ready-to-be-read flag
 772                          * for epoll_wait.
 773                          */
 774                         bytes_read = read(events[n].data.fd, &buf, bytes_read);
 775                         if (bytes_read < 0) {
 776                                 if (errno == EINTR || errno == EWOULDBLOCK)
 777                                         continue;
 778
 779                                 RTE_LOG(ERR, EAL, "Error reading from file "
 780                                         "descriptor %d: %s\n",
 781                                         events[n].data.fd,
 782                                         strerror(errno));
 783                         } else if (bytes_read == 0)
 784                                 RTE_LOG(ERR, EAL, "Read nothing from file "
 785                                         "descriptor %d\n", events[n].data.fd);
 786                         else
 787                                 call = true;
 788                 }
 789
 790                 /* grab a lock, again to call callbacks and update status. */
 791                 rte_spinlock_lock(&intr_lock);
 792
 793                 if (call) {
 794
 795                         /* Finally, call all callbacks. */
 796                         TAILQ_FOREACH(cb, &src->callbacks, next) {
 797
 798                                 /* make a copy and unlock. */
 799                                 active_cb = *cb;
 800                                 rte_spinlock_unlock(&intr_lock);
 801
 802                                 /* call the actual callback */
 803                                 active_cb.cb_fn(active_cb.cb_arg);
 804
 805                                 /*get the lock back. */
 806                                 rte_spinlock_lock(&intr_lock);
 807                         }
 808                 }
 809
 810                 /* we done with that interrupt source, release it. */
 811                 src->active = 0;
 812                 rte_spinlock_unlock(&intr_lock);
 813         }
 814
 815         return 0;
 816 }
 817
 818 /**
 819  * It handles all the interrupts.
 820  *
 821  * @param pfd
 822  *  epoll file descriptor.
 823  * @param totalfds
 824  *  The number of file descriptors added in epoll.
 825  *
 826  * @return
 827  *  void
 828  */
 829 static void
 830 eal_intr_handle_interrupts(int pfd, unsigned totalfds)
 831 {
 832         struct epoll_event events[totalfds];
 833         int nfds = 0;
 834
 835         for(;;) {
 836                 nfds = epoll_wait(pfd, events, totalfds,
 837                         EAL_INTR_EPOLL_WAIT_FOREVER);
 838                 /* epoll_wait fail */
 839                 if (nfds < 0) {
 840                         if (errno == EINTR)
 841                                 continue;
 842                         RTE_LOG(ERR, EAL,
 843                                 "epoll_wait returns with fail\n");
 844                         return;
 845                 }
 846                 /* epoll_wait timeout, will never happens here */
 847                 else if (nfds == 0)
 848                         continue;
 849                 /* epoll_wait has at least one fd ready to read */
 850                 if (eal_intr_process_interrupts(events, nfds) < 0)
 851                         return;
 852         }
 853 }
 854
 855 /**
 856  * It builds/rebuilds up the epoll file descriptor with all the
 857  * file descriptors being waited on. Then handles the interrupts.
 858  *
 859  * @param arg
 860  *  pointer. (unused)
 861  *
 862  * @return
 863  *  never return;
 864  */
 865 static __attribute__((noreturn)) void *
 866 eal_intr_thread_main(__rte_unused void *arg)
 867 {
 868         struct epoll_event ev;
 869
 870         /* host thread, never break out */
 871         for (;;) {
 872                 /* build up the epoll fd with all descriptors we are to
 873                  * wait on then pass it to the handle_interrupts function
 874                  */
 875                 static struct epoll_event pipe_event = {
 876                         .events = EPOLLIN | EPOLLPRI,
 877                 };
 878                 struct rte_intr_source *src;
 879                 unsigned numfds = 0;
 880
 881                 /* create epoll fd */
 882                 int pfd = epoll_create(1);
 883                 if (pfd < 0)
 884                         rte_panic("Cannot create epoll instance\n");
 885
 886                 pipe_event.data.fd = intr_pipe.readfd;
 887                 /**
 888                  * add pipe fd into wait list, this pipe is used to
 889                  * rebuild the wait list.
 890                  */
 891                 if (epoll_ctl(pfd, EPOLL_CTL_ADD, intr_pipe.readfd,
 892                                                 &pipe_event) < 0) {
 893                         rte_panic("Error adding fd to %d epoll_ctl, %s\n",
 894                                         intr_pipe.readfd, strerror(errno));
 895                 }
 896                 numfds++;
 897
 898                 rte_spinlock_lock(&intr_lock);
 899
 900                 TAILQ_FOREACH(src, &intr_sources, next) {
 901                         if (src->callbacks.tqh_first == NULL)
 902                                 continue; /* skip those with no callbacks */
 903                         ev.events = EPOLLIN | EPOLLPRI | EPOLLRDHUP | EPOLLHUP;
 904                         ev.data.fd = src->intr_handle.fd;
 905
 906                         /**
 907                          * add all the uio device file descriptor
 908                          * into wait list.
 909                          */
 910                         if (epoll_ctl(pfd, EPOLL_CTL_ADD,
 911                                         src->intr_handle.fd, &ev) < 0){
 912                                 rte_panic("Error adding fd %d epoll_ctl, %s\n",
 913                                         src->intr_handle.fd, strerror(errno));
 914                         }
 915                         else
 916                                 numfds++;
 917                 }
 918                 rte_spinlock_unlock(&intr_lock);
 919                 /* serve the interrupt */
 920                 eal_intr_handle_interrupts(pfd, numfds);
 921
 922                 /**
 923                  * when we return, we need to rebuild the
 924                  * list of fds to monitor.
 925                  */
 926                 close(pfd);
 927         }
 928 }
 929
 930 int
 931 rte_eal_intr_init(void)
 932 {
 933         int ret = 0;
 934
 935         /* init the global interrupt source head */
 936         TAILQ_INIT(&intr_sources);
 937
 938         /**
 939          * create a pipe which will be waited by epoll and notified to
 940          * rebuild the wait list of epoll.
 941          */
 942         if (pipe(intr_pipe.pipefd) < 0) {
 943                 rte_errno = errno;
 944                 return -1;
 945         }
 946
 947         /* create the host thread to wait/handle the interrupt */
 948         ret = rte_ctrl_thread_create(&intr_thread, "eal-intr-thread", NULL,
 949                         eal_intr_thread_main, NULL);
 950         if (ret != 0) {
 951                 rte_errno = -ret;
 952                 RTE_LOG(ERR, EAL,
 953                         "Failed to create thread for interrupt handling\n");
 954         }
 955
 956         return ret;
 957 }
 958
 959 static void
 960 eal_intr_proc_rxtx_intr(int fd, const struct rte_intr_handle *intr_handle)
 961 {
 962         union rte_intr_read_buffer buf;
 963         int bytes_read = 0;
 964         int nbytes;
 965
 966         switch (intr_handle->type) {
 967         case RTE_INTR_HANDLE_UIO:
 968         case RTE_INTR_HANDLE_UIO_INTX:
 969                 bytes_read = sizeof(buf.uio_intr_count);
 970                 break;
 971 #ifdef VFIO_PRESENT
 972         case RTE_INTR_HANDLE_VFIO_MSIX:
 973         case RTE_INTR_HANDLE_VFIO_MSI:
 974         case RTE_INTR_HANDLE_VFIO_LEGACY:
 975                 bytes_read = sizeof(buf.vfio_intr_count);
 976                 break;
 977 #endif
 978         case RTE_INTR_HANDLE_VDEV:
 979                 bytes_read = intr_handle->efd_counter_size;
 980                 /* For vdev, number of bytes to read is set by driver */
 981                 break;
 982         case RTE_INTR_HANDLE_EXT:
 983                 return;
 984         default:
 985                 bytes_read = 1;
 986                 RTE_LOG(INFO, EAL, "unexpected intr type\n");
 987                 break;
 988         }
 989
 990         /**
 991          * read out to clear the ready-to-be-read flag
 992          * for epoll_wait.
 993          */
 994         if (bytes_read == 0)
 995                 return;
 996         do {
 997                 nbytes = read(fd, &buf, bytes_read);
 998                 if (nbytes < 0) {
 999                         if (errno == EINTR || errno == EWOULDBLOCK ||
1000                             errno == EAGAIN)
1001                                 continue;
1002                         RTE_LOG(ERR, EAL,
1003                                 "Error reading from fd %d: %s\n",
1004                                 fd, strerror(errno));
1005                 } else if (nbytes == 0)
1006                         RTE_LOG(ERR, EAL, "Read nothing from fd %d\n", fd);
1007                 return;
1008         } while (1);
1009 }
1010
1011 static int
1012 eal_epoll_process_event(struct epoll_event *evs, unsigned int n,
1013                         struct rte_epoll_event *events)
1014 {
1015         unsigned int i, count = 0;
1016         struct rte_epoll_event *rev;
1017
1018         for (i = 0; i < n; i++) {
1019                 rev = evs[i].data.ptr;
1020                 if (!rev || !rte_atomic32_cmpset(&rev->status, RTE_EPOLL_VALID,
1021                                                  RTE_EPOLL_EXEC))
1022                         continue;
1023
1024                 events[count].status        = RTE_EPOLL_VALID;
1025                 events[count].fd            = rev->fd;
1026                 events[count].epfd          = rev->epfd;
1027                 events[count].epdata.event  = rev->epdata.event;
1028                 events[count].epdata.data   = rev->epdata.data;
1029                 if (rev->epdata.cb_fun)
1030                         rev->epdata.cb_fun(rev->fd,
1031                                            rev->epdata.cb_arg);
1032
1033                 rte_compiler_barrier();
1034                 rev->status = RTE_EPOLL_VALID;
1035                 count++;
1036         }
1037         return count;
1038 }
1039
1040 static inline int
1041 eal_init_tls_epfd(void)
1042 {
1043         int pfd = epoll_create(255);
1044
1045         if (pfd < 0) {
1046                 RTE_LOG(ERR, EAL,
1047                         "Cannot create epoll instance\n");
1048                 return -1;
1049         }
1050         return pfd;
1051 }
1052
1053 int
1054 rte_intr_tls_epfd(void)
1055 {
1056         if (RTE_PER_LCORE(_epfd) == -1)
1057                 RTE_PER_LCORE(_epfd) = eal_init_tls_epfd();
1058
1059         return RTE_PER_LCORE(_epfd);
1060 }
1061
1062 int
1063 rte_epoll_wait(int epfd, struct rte_epoll_event *events,
1064                int maxevents, int timeout)
1065 {
1066         struct epoll_event evs[maxevents];
1067         int rc;
1068
1069         if (!events) {
1070                 RTE_LOG(ERR, EAL, "rte_epoll_event can't be NULL\n");
1071                 return -1;
1072         }
1073
1074         /* using per thread epoll fd */
1075         if (epfd == RTE_EPOLL_PER_THREAD)
1076                 epfd = rte_intr_tls_epfd();
1077
1078         while (1) {
1079                 rc = epoll_wait(epfd, evs, maxevents, timeout);
1080                 if (likely(rc > 0)) {
1081                         /* epoll_wait has at least one fd ready to read */
1082                         rc = eal_epoll_process_event(evs, rc, events);
1083                         break;
1084                 } else if (rc < 0) {
1085                         if (errno == EINTR)
1086                                 continue;
1087                         /* epoll_wait fail */
1088                         RTE_LOG(ERR, EAL, "epoll_wait returns with fail %s\n",
1089                                 strerror(errno));
1090                         rc = -1;
1091                         break;
1092                 } else {
1093                         /* rc == 0, epoll_wait timed out */
1094                         break;
1095                 }
1096         }
1097
1098         return rc;
1099 }
1100
1101 static inline void
1102 eal_epoll_data_safe_free(struct rte_epoll_event *ev)
1103 {
1104         while (!rte_atomic32_cmpset(&ev->status, RTE_EPOLL_VALID,
1105                                     RTE_EPOLL_INVALID))
1106                 while (ev->status != RTE_EPOLL_VALID)
1107                         rte_pause();
1108         memset(&ev->epdata, 0, sizeof(ev->epdata));
1109         ev->fd = -1;
1110         ev->epfd = -1;
1111 }
1112
1113 int
1114 rte_epoll_ctl(int epfd, int op, int fd,
1115               struct rte_epoll_event *event)
1116 {
1117         struct epoll_event ev;
1118
1119         if (!event) {
1120                 RTE_LOG(ERR, EAL, "rte_epoll_event can't be NULL\n");
1121                 return -1;
1122         }
1123
1124         /* using per thread epoll fd */
1125         if (epfd == RTE_EPOLL_PER_THREAD)
1126                 epfd = rte_intr_tls_epfd();
1127
1128         if (op == EPOLL_CTL_ADD) {
1129                 event->status = RTE_EPOLL_VALID;
1130                 event->fd = fd;  /* ignore fd in event */
1131                 event->epfd = epfd;
1132                 ev.data.ptr = (void *)event;
1133         }
1134
1135         ev.events = event->epdata.event;
1136         if (epoll_ctl(epfd, op, fd, &ev) < 0) {
1137                 RTE_LOG(ERR, EAL, "Error op %d fd %d epoll_ctl, %s\n",
1138                         op, fd, strerror(errno));
1139                 if (op == EPOLL_CTL_ADD)
1140                         /* rollback status when CTL_ADD fail */
1141                         event->status = RTE_EPOLL_INVALID;
1142                 return -1;
1143         }
1144
1145         if (op == EPOLL_CTL_DEL && event->status != RTE_EPOLL_INVALID)
1146                 eal_epoll_data_safe_free(event);
1147
1148         return 0;
1149 }
1150
1151 int
1152 rte_intr_rx_ctl(struct rte_intr_handle *intr_handle, int epfd,
1153                 int op, unsigned int vec, void *data)
1154 {
1155         struct rte_epoll_event *rev;
1156         struct rte_epoll_data *epdata;
1157         int epfd_op;
1158         unsigned int efd_idx;
1159         int rc = 0;
1160
1161         efd_idx = (vec >= RTE_INTR_VEC_RXTX_OFFSET) ?
1162                 (vec - RTE_INTR_VEC_RXTX_OFFSET) : vec;
1163
1164         if (!intr_handle || intr_handle->nb_efd == 0 ||
1165             efd_idx >= intr_handle->nb_efd) {
1166                 RTE_LOG(ERR, EAL, "Wrong intr vector number.\n");
1167                 return -EPERM;
1168         }
1169
1170         switch (op) {
1171         case RTE_INTR_EVENT_ADD:
1172                 epfd_op = EPOLL_CTL_ADD;
1173                 rev = &intr_handle->elist[efd_idx];
1174                 if (rev->status != RTE_EPOLL_INVALID) {
1175                         RTE_LOG(INFO, EAL, "Event already been added.\n");
1176                         return -EEXIST;
1177                 }
1178
1179                 /* attach to intr vector fd */
1180                 epdata = &rev->epdata;
1181                 epdata->event  = EPOLLIN | EPOLLPRI | EPOLLET;
1182                 epdata->data   = data;
1183                 epdata->cb_fun = (rte_intr_event_cb_t)eal_intr_proc_rxtx_intr;
1184                 epdata->cb_arg = (void *)intr_handle;
1185                 rc = rte_epoll_ctl(epfd, epfd_op,
1186                                    intr_handle->efds[efd_idx], rev);
1187                 if (!rc)
1188                         RTE_LOG(DEBUG, EAL,
1189                                 "efd %d associated with vec %d added on epfd %d"
1190                                 "\n", rev->fd, vec, epfd);
1191                 else
1192                         rc = -EPERM;
1193                 break;
1194         case RTE_INTR_EVENT_DEL:
1195                 epfd_op = EPOLL_CTL_DEL;
1196                 rev = &intr_handle->elist[efd_idx];
1197                 if (rev->status == RTE_EPOLL_INVALID) {
1198                         RTE_LOG(INFO, EAL, "Event does not exist.\n");
1199                         return -EPERM;
1200                 }
1201
1202                 rc = rte_epoll_ctl(rev->epfd, epfd_op, rev->fd, rev);
1203                 if (rc)
1204                         rc = -EPERM;
1205                 break;
1206         default:
1207                 RTE_LOG(ERR, EAL, "event op type mismatch\n");
1208                 rc = -EPERM;
1209         }
1210
1211         return rc;
1212 }
1213
1214 void
1215 rte_intr_free_epoll_fd(struct rte_intr_handle *intr_handle)
1216 {
1217         uint32_t i;
1218         struct rte_epoll_event *rev;
1219
1220         for (i = 0; i < intr_handle->nb_efd; i++) {
1221                 rev = &intr_handle->elist[i];
1222                 if (rev->status == RTE_EPOLL_INVALID)
1223                         continue;
1224                 if (rte_epoll_ctl(rev->epfd, EPOLL_CTL_DEL, rev->fd, rev)) {
1225                         /* force free if the entry valid */
1226                         eal_epoll_data_safe_free(rev);
1227                         rev->status = RTE_EPOLL_INVALID;
1228                 }
1229         }
1230 }
1231
1232 int
1233 rte_intr_efd_enable(struct rte_intr_handle *intr_handle, uint32_t nb_efd)
1234 {
1235         uint32_t i;
1236         int fd;
1237         uint32_t n = RTE_MIN(nb_efd, (uint32_t)RTE_MAX_RXTX_INTR_VEC_ID);
1238
1239         assert(nb_efd != 0);
1240
1241         if (intr_handle->type == RTE_INTR_HANDLE_VFIO_MSIX) {
1242                 for (i = 0; i < n; i++) {
1243                         fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
1244                         if (fd < 0) {
1245                                 RTE_LOG(ERR, EAL,
1246                                         "can't setup eventfd, error %i (%s)\n",
1247                                         errno, strerror(errno));
1248                                 return -errno;
1249                         }
1250                         intr_handle->efds[i] = fd;
1251                 }
1252                 intr_handle->nb_efd   = n;
1253                 intr_handle->max_intr = NB_OTHER_INTR + n;
1254         } else if (intr_handle->type == RTE_INTR_HANDLE_VDEV) {
1255                 /* only check, initialization would be done in vdev driver.*/
1256                 if (intr_handle->efd_counter_size >
1257                     sizeof(union rte_intr_read_buffer)) {
1258                         RTE_LOG(ERR, EAL, "the efd_counter_size is oversized");
1259                         return -EINVAL;
1260                 }
1261         } else {
1262                 intr_handle->efds[0]  = intr_handle->fd;
1263                 intr_handle->nb_efd   = RTE_MIN(nb_efd, 1U);
1264                 intr_handle->max_intr = NB_OTHER_INTR;
1265         }
1266
1267         return 0;
1268 }
1269
1270 void
1271 rte_intr_efd_disable(struct rte_intr_handle *intr_handle)
1272 {
1273         uint32_t i;
1274
1275         rte_intr_free_epoll_fd(intr_handle);
1276         if (intr_handle->max_intr > intr_handle->nb_efd) {
1277                 for (i = 0; i < intr_handle->nb_efd; i++)
1278                         close(intr_handle->efds[i]);
1279         }
1280         intr_handle->nb_efd = 0;
1281         intr_handle->max_intr = 0;
1282 }
1283
1284 int
1285 rte_intr_dp_is_en(struct rte_intr_handle *intr_handle)
1286 {
1287         return !(!intr_handle->nb_efd);
1288 }
1289
1290 int
1291 rte_intr_allow_others(struct rte_intr_handle *intr_handle)
1292 {
1293         if (!rte_intr_dp_is_en(intr_handle))
1294                 return 1;
1295         else
1296                 return !!(intr_handle->max_intr - intr_handle->nb_efd);
1297 }
1298
1299 int
1300 rte_intr_cap_multiple(struct rte_intr_handle *intr_handle)
1301 {
1302         if (intr_handle->type == RTE_INTR_HANDLE_VFIO_MSIX)
1303                 return 1;
1304
1305         if (intr_handle->type == RTE_INTR_HANDLE_VDEV)
1306                 return 1;
1307
1308         return 0;
1309 }