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 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
 313 /* enable req notifier */
 314 static int
 315 vfio_enable_req(const struct rte_intr_handle *intr_handle)
 316 {
 317         int len, ret;
 318         char irq_set_buf[IRQ_SET_BUF_LEN];
 319         struct vfio_irq_set *irq_set;
 320         int *fd_ptr;
 321
 322         len = sizeof(irq_set_buf);
 323
 324         irq_set = (struct vfio_irq_set *) irq_set_buf;
 325         irq_set->argsz = len;
 326         irq_set->count = 1;
 327         irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
 328                          VFIO_IRQ_SET_ACTION_TRIGGER;
 329         irq_set->index = VFIO_PCI_REQ_IRQ_INDEX;
 330         irq_set->start = 0;
 331         fd_ptr = (int *) &irq_set->data;
 332         *fd_ptr = intr_handle->fd;
 333
 334         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 335
 336         if (ret) {
 337                 RTE_LOG(ERR, EAL, "Error enabling req interrupts for fd %d\n",
 338                                                 intr_handle->fd);
 339                 return -1;
 340         }
 341
 342         return 0;
 343 }
 344
 345 /* disable req notifier */
 346 static int
 347 vfio_disable_req(const struct rte_intr_handle *intr_handle)
 348 {
 349         struct vfio_irq_set *irq_set;
 350         char irq_set_buf[IRQ_SET_BUF_LEN];
 351         int len, ret;
 352
 353         len = sizeof(struct vfio_irq_set);
 354
 355         irq_set = (struct vfio_irq_set *) irq_set_buf;
 356         irq_set->argsz = len;
 357         irq_set->count = 0;
 358         irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER;
 359         irq_set->index = VFIO_PCI_REQ_IRQ_INDEX;
 360         irq_set->start = 0;
 361
 362         ret = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
 363
 364         if (ret)
 365                 RTE_LOG(ERR, EAL, "Error disabling req interrupts for fd %d\n",
 366                         intr_handle->fd);
 367
 368         return ret;
 369 }
 370 #endif
 371 #endif
 372
 373 static int
 374 uio_intx_intr_disable(const struct rte_intr_handle *intr_handle)
 375 {
 376         unsigned char command_high;
 377
 378         /* use UIO config file descriptor for uio_pci_generic */
 379         if (pread(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
 380                 RTE_LOG(ERR, EAL,
 381                         "Error reading interrupts status for fd %d\n",
 382                         intr_handle->uio_cfg_fd);
 383                 return -1;
 384         }
 385         /* disable interrupts */
 386         command_high |= 0x4;
 387         if (pwrite(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
 388                 RTE_LOG(ERR, EAL,
 389                         "Error disabling interrupts for fd %d\n",
 390                         intr_handle->uio_cfg_fd);
 391                 return -1;
 392         }
 393
 394         return 0;
 395 }
 396
 397 static int
 398 uio_intx_intr_enable(const struct rte_intr_handle *intr_handle)
 399 {
 400         unsigned char command_high;
 401
 402         /* use UIO config file descriptor for uio_pci_generic */
 403         if (pread(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
 404                 RTE_LOG(ERR, EAL,
 405                         "Error reading interrupts status for fd %d\n",
 406                         intr_handle->uio_cfg_fd);
 407                 return -1;
 408         }
 409         /* enable interrupts */
 410         command_high &= ~0x4;
 411         if (pwrite(intr_handle->uio_cfg_fd, &command_high, 1, 5) != 1) {
 412                 RTE_LOG(ERR, EAL,
 413                         "Error enabling interrupts for fd %d\n",
 414                         intr_handle->uio_cfg_fd);
 415                 return -1;
 416         }
 417
 418         return 0;
 419 }
 420
 421 static int
 422 uio_intr_disable(const struct rte_intr_handle *intr_handle)
 423 {
 424         const int value = 0;
 425
 426         if (write(intr_handle->fd, &value, sizeof(value)) < 0) {
 427                 RTE_LOG(ERR, EAL,
 428                         "Error disabling interrupts for fd %d (%s)\n",
 429                         intr_handle->fd, strerror(errno));
 430                 return -1;
 431         }
 432         return 0;
 433 }
 434
 435 static int
 436 uio_intr_enable(const struct rte_intr_handle *intr_handle)
 437 {
 438         const int value = 1;
 439
 440         if (write(intr_handle->fd, &value, sizeof(value)) < 0) {
 441                 RTE_LOG(ERR, EAL,
 442                         "Error enabling interrupts for fd %d (%s)\n",
 443                         intr_handle->fd, strerror(errno));
 444                 return -1;
 445         }
 446         return 0;
 447 }
 448
 449 int
 450 rte_intr_callback_register(const struct rte_intr_handle *intr_handle,
 451                         rte_intr_callback_fn cb, void *cb_arg)
 452 {
 453         int ret, wake_thread;
 454         struct rte_intr_source *src;
 455         struct rte_intr_callback *callback;
 456
 457         wake_thread = 0;
 458
 459         /* first do parameter checking */
 460         if (intr_handle == NULL || intr_handle->fd < 0 || cb == NULL) {
 461                 RTE_LOG(ERR, EAL,
 462                         "Registering with invalid input parameter\n");
 463                 return -EINVAL;
 464         }
 465
 466         /* allocate a new interrupt callback entity */
 467         callback = calloc(1, sizeof(*callback));
 468         if (callback == NULL) {
 469                 RTE_LOG(ERR, EAL, "Can not allocate memory\n");
 470                 return -ENOMEM;
 471         }
 472         callback->cb_fn = cb;
 473         callback->cb_arg = cb_arg;
 474
 475         rte_spinlock_lock(&intr_lock);
 476
 477         /* check if there is at least one callback registered for the fd */
 478         TAILQ_FOREACH(src, &intr_sources, next) {
 479                 if (src->intr_handle.fd == intr_handle->fd) {
 480                         /* we had no interrupts for this */
 481                         if (TAILQ_EMPTY(&src->callbacks))
 482                                 wake_thread = 1;
 483
 484                         TAILQ_INSERT_TAIL(&(src->callbacks), callback, next);
 485                         ret = 0;
 486                         break;
 487                 }
 488         }
 489
 490         /* no existing callbacks for this - add new source */
 491         if (src == NULL) {
 492                 src = calloc(1, sizeof(*src));
 493                 if (src == NULL) {
 494                         RTE_LOG(ERR, EAL, "Can not allocate memory\n");
 495                         free(callback);
 496                         ret = -ENOMEM;
 497                 } else {
 498                         src->intr_handle = *intr_handle;
 499                         TAILQ_INIT(&src->callbacks);
 500                         TAILQ_INSERT_TAIL(&(src->callbacks), callback, next);
 501                         TAILQ_INSERT_TAIL(&intr_sources, src, next);
 502                         wake_thread = 1;
 503                         ret = 0;
 504                 }
 505         }
 506
 507         rte_spinlock_unlock(&intr_lock);
 508
 509         /**
 510          * check if need to notify the pipe fd waited by epoll_wait to
 511          * rebuild the wait list.
 512          */
 513         if (wake_thread)
 514                 if (write(intr_pipe.writefd, "1", 1) < 0)
 515                         return -EPIPE;
 516
 517         return ret;
 518 }
 519
 520 int
 521 rte_intr_callback_unregister(const struct rte_intr_handle *intr_handle,
 522                         rte_intr_callback_fn cb_fn, void *cb_arg)
 523 {
 524         int ret;
 525         struct rte_intr_source *src;
 526         struct rte_intr_callback *cb, *next;
 527
 528         /* do parameter checking first */
 529         if (intr_handle == NULL || intr_handle->fd < 0) {
 530                 RTE_LOG(ERR, EAL,
 531                 "Unregistering with invalid input parameter\n");
 532                 return -EINVAL;
 533         }
 534
 535         rte_spinlock_lock(&intr_lock);
 536
 537         /* check if the insterrupt source for the fd is existent */
 538         TAILQ_FOREACH(src, &intr_sources, next)
 539                 if (src->intr_handle.fd == intr_handle->fd)
 540                         break;
 541
 542         /* No interrupt source registered for the fd */
 543         if (src == NULL) {
 544                 ret = -ENOENT;
 545
 546         /* interrupt source has some active callbacks right now. */
 547         } else if (src->active != 0) {
 548                 ret = -EAGAIN;
 549
 550         /* ok to remove. */
 551         } else {
 552                 ret = 0;
 553
 554                 /*walk through the callbacks and remove all that match. */
 555                 for (cb = TAILQ_FIRST(&src->callbacks); cb != NULL; cb = next) {
 556
 557                         next = TAILQ_NEXT(cb, next);
 558
 559                         if (cb->cb_fn == cb_fn && (cb_arg == (void *)-1 ||
 560                                         cb->cb_arg == cb_arg)) {
 561                                 TAILQ_REMOVE(&src->callbacks, cb, next);
 562                                 free(cb);
 563                                 ret++;
 564                         }
 565                 }
 566
 567                 /* all callbacks for that source are removed. */
 568                 if (TAILQ_EMPTY(&src->callbacks)) {
 569                         TAILQ_REMOVE(&intr_sources, src, next);
 570                         free(src);
 571                 }
 572         }
 573
 574         rte_spinlock_unlock(&intr_lock);
 575
 576         /* notify the pipe fd waited by epoll_wait to rebuild the wait list */
 577         if (ret >= 0 && write(intr_pipe.writefd, "1", 1) < 0) {
 578                 ret = -EPIPE;
 579         }
 580
 581         return ret;
 582 }
 583
 584 int
 585 rte_intr_enable(const struct rte_intr_handle *intr_handle)
 586 {
 587         if (intr_handle && intr_handle->type == RTE_INTR_HANDLE_VDEV)
 588                 return 0;
 589
 590         if (!intr_handle || intr_handle->fd < 0 || intr_handle->uio_cfg_fd < 0)
 591                 return -1;
 592
 593         switch (intr_handle->type){
 594         /* write to the uio fd to enable the interrupt */
 595         case RTE_INTR_HANDLE_UIO:
 596                 if (uio_intr_enable(intr_handle))
 597                         return -1;
 598                 break;
 599         case RTE_INTR_HANDLE_UIO_INTX:
 600                 if (uio_intx_intr_enable(intr_handle))
 601                         return -1;
 602                 break;
 603         /* not used at this moment */
 604         case RTE_INTR_HANDLE_ALARM:
 605                 return -1;
 606 #ifdef VFIO_PRESENT
 607         case RTE_INTR_HANDLE_VFIO_MSIX:
 608                 if (vfio_enable_msix(intr_handle))
 609                         return -1;
 610                 break;
 611         case RTE_INTR_HANDLE_VFIO_MSI:
 612                 if (vfio_enable_msi(intr_handle))
 613                         return -1;
 614                 break;
 615         case RTE_INTR_HANDLE_VFIO_LEGACY:
 616                 if (vfio_enable_intx(intr_handle))
 617                         return -1;
 618                 break;
 619 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
 620         case RTE_INTR_HANDLE_VFIO_REQ:
 621                 if (vfio_enable_req(intr_handle))
 622                         return -1;
 623                 break;
 624 #endif
 625 #endif
 626         /* not used at this moment */
 627         case RTE_INTR_HANDLE_DEV_EVENT:
 628                 return -1;
 629         /* unknown handle type */
 630         default:
 631                 RTE_LOG(ERR, EAL,
 632                         "Unknown handle type of fd %d\n",
 633                                         intr_handle->fd);
 634                 return -1;
 635         }
 636
 637         return 0;
 638 }
 639
 640 int
 641 rte_intr_disable(const struct rte_intr_handle *intr_handle)
 642 {
 643         if (intr_handle && intr_handle->type == RTE_INTR_HANDLE_VDEV)
 644                 return 0;
 645
 646         if (!intr_handle || intr_handle->fd < 0 || intr_handle->uio_cfg_fd < 0)
 647                 return -1;
 648
 649         switch (intr_handle->type){
 650         /* write to the uio fd to disable the interrupt */
 651         case RTE_INTR_HANDLE_UIO:
 652                 if (uio_intr_disable(intr_handle))
 653                         return -1;
 654                 break;
 655         case RTE_INTR_HANDLE_UIO_INTX:
 656                 if (uio_intx_intr_disable(intr_handle))
 657                         return -1;
 658                 break;
 659         /* not used at this moment */
 660         case RTE_INTR_HANDLE_ALARM:
 661                 return -1;
 662 #ifdef VFIO_PRESENT
 663         case RTE_INTR_HANDLE_VFIO_MSIX:
 664                 if (vfio_disable_msix(intr_handle))
 665                         return -1;
 666                 break;
 667         case RTE_INTR_HANDLE_VFIO_MSI:
 668                 if (vfio_disable_msi(intr_handle))
 669                         return -1;
 670                 break;
 671         case RTE_INTR_HANDLE_VFIO_LEGACY:
 672                 if (vfio_disable_intx(intr_handle))
 673                         return -1;
 674                 break;
 675 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
 676         case RTE_INTR_HANDLE_VFIO_REQ:
 677                 if (vfio_disable_req(intr_handle))
 678                         return -1;
 679                 break;
 680 #endif
 681 #endif
 682         /* not used at this moment */
 683         case RTE_INTR_HANDLE_DEV_EVENT:
 684                 return -1;
 685         /* unknown handle type */
 686         default:
 687                 RTE_LOG(ERR, EAL,
 688                         "Unknown handle type of fd %d\n",
 689                                         intr_handle->fd);
 690                 return -1;
 691         }
 692
 693         return 0;
 694 }
 695
 696 static int
 697 eal_intr_process_interrupts(struct epoll_event *events, int nfds)
 698 {
 699         bool call = false;
 700         int n, bytes_read;
 701         struct rte_intr_source *src;
 702         struct rte_intr_callback *cb;
 703         union rte_intr_read_buffer buf;
 704         struct rte_intr_callback active_cb;
 705
 706         for (n = 0; n < nfds; n++) {
 707
 708                 /**
 709                  * if the pipe fd is ready to read, return out to
 710                  * rebuild the wait list.
 711                  */
 712                 if (events[n].data.fd == intr_pipe.readfd){
 713                         int r = read(intr_pipe.readfd, buf.charbuf,
 714                                         sizeof(buf.charbuf));
 715                         RTE_SET_USED(r);
 716                         return -1;
 717                 }
 718                 rte_spinlock_lock(&intr_lock);
 719                 TAILQ_FOREACH(src, &intr_sources, next)
 720                         if (src->intr_handle.fd ==
 721                                         events[n].data.fd)
 722                                 break;
 723                 if (src == NULL){
 724                         rte_spinlock_unlock(&intr_lock);
 725                         continue;
 726                 }
 727
 728                 /* mark this interrupt source as active and release the lock. */
 729                 src->active = 1;
 730                 rte_spinlock_unlock(&intr_lock);
 731
 732                 /* set the length to be read dor different handle type */
 733                 switch (src->intr_handle.type) {
 734                 case RTE_INTR_HANDLE_UIO:
 735                 case RTE_INTR_HANDLE_UIO_INTX:
 736                         bytes_read = sizeof(buf.uio_intr_count);
 737                         break;
 738                 case RTE_INTR_HANDLE_ALARM:
 739                         bytes_read = sizeof(buf.timerfd_num);
 740                         break;
 741 #ifdef VFIO_PRESENT
 742                 case RTE_INTR_HANDLE_VFIO_MSIX:
 743                 case RTE_INTR_HANDLE_VFIO_MSI:
 744                 case RTE_INTR_HANDLE_VFIO_LEGACY:
 745                         bytes_read = sizeof(buf.vfio_intr_count);
 746                         break;
 747 #ifdef HAVE_VFIO_DEV_REQ_INTERFACE
 748                 case RTE_INTR_HANDLE_VFIO_REQ:
 749                         bytes_read = 0;
 750                         call = true;
 751                         break;
 752 #endif
 753 #endif
 754                 case RTE_INTR_HANDLE_VDEV:
 755                 case RTE_INTR_HANDLE_EXT:
 756                         bytes_read = 0;
 757                         call = true;
 758                         break;
 759                 case RTE_INTR_HANDLE_DEV_EVENT:
 760                         bytes_read = 0;
 761                         call = true;
 762                         break;
 763                 default:
 764                         bytes_read = 1;
 765                         break;
 766                 }
 767
 768                 if (bytes_read > 0) {
 769                         /**
 770                          * read out to clear the ready-to-be-read flag
 771                          * for epoll_wait.
 772                          */
 773                         bytes_read = read(events[n].data.fd, &buf, bytes_read);
 774                         if (bytes_read < 0) {
 775                                 if (errno == EINTR || errno == EWOULDBLOCK)
 776                                         continue;
 777
 778                                 RTE_LOG(ERR, EAL, "Error reading from file "
 779                                         "descriptor %d: %s\n",
 780                                         events[n].data.fd,
 781                                         strerror(errno));
 782                         } else if (bytes_read == 0)
 783                                 RTE_LOG(ERR, EAL, "Read nothing from file "
 784                                         "descriptor %d\n", events[n].data.fd);
 785                         else
 786                                 call = true;
 787                 }
 788
 789                 /* grab a lock, again to call callbacks and update status. */
 790                 rte_spinlock_lock(&intr_lock);
 791
 792                 if (call) {
 793
 794                         /* Finally, call all callbacks. */
 795                         TAILQ_FOREACH(cb, &src->callbacks, next) {
 796
 797                                 /* make a copy and unlock. */
 798                                 active_cb = *cb;
 799                                 rte_spinlock_unlock(&intr_lock);
 800
 801                                 /* call the actual callback */
 802                                 active_cb.cb_fn(active_cb.cb_arg);
 803
 804                                 /*get the lock back. */
 805                                 rte_spinlock_lock(&intr_lock);
 806                         }
 807                 }
 808
 809                 /* we done with that interrupt source, release it. */
 810                 src->active = 0;
 811                 rte_spinlock_unlock(&intr_lock);
 812         }
 813
 814         return 0;
 815 }
 816
 817 /**
 818  * It handles all the interrupts.
 819  *
 820  * @param pfd
 821  *  epoll file descriptor.
 822  * @param totalfds
 823  *  The number of file descriptors added in epoll.
 824  *
 825  * @return
 826  *  void
 827  */
 828 static void
 829 eal_intr_handle_interrupts(int pfd, unsigned totalfds)
 830 {
 831         struct epoll_event events[totalfds];
 832         int nfds = 0;
 833
 834         for(;;) {
 835                 nfds = epoll_wait(pfd, events, totalfds,
 836                         EAL_INTR_EPOLL_WAIT_FOREVER);
 837                 /* epoll_wait fail */
 838                 if (nfds < 0) {
 839                         if (errno == EINTR)
 840                                 continue;
 841                         RTE_LOG(ERR, EAL,
 842                                 "epoll_wait returns with fail\n");
 843                         return;
 844                 }
 845                 /* epoll_wait timeout, will never happens here */
 846                 else if (nfds == 0)
 847                         continue;
 848                 /* epoll_wait has at least one fd ready to read */
 849                 if (eal_intr_process_interrupts(events, nfds) < 0)
 850                         return;
 851         }
 852 }
 853
 854 /**
 855  * It builds/rebuilds up the epoll file descriptor with all the
 856  * file descriptors being waited on. Then handles the interrupts.
 857  *
 858  * @param arg
 859  *  pointer. (unused)
 860  *
 861  * @return
 862  *  never return;
 863  */
 864 static __attribute__((noreturn)) void *
 865 eal_intr_thread_main(__rte_unused void *arg)
 866 {
 867         struct epoll_event ev;
 868
 869         /* host thread, never break out */
 870         for (;;) {
 871                 /* build up the epoll fd with all descriptors we are to
 872                  * wait on then pass it to the handle_interrupts function
 873                  */
 874                 static struct epoll_event pipe_event = {
 875                         .events = EPOLLIN | EPOLLPRI,
 876                 };
 877                 struct rte_intr_source *src;
 878                 unsigned numfds = 0;
 879
 880                 /* create epoll fd */
 881                 int pfd = epoll_create(1);
 882                 if (pfd < 0)
 883                         rte_panic("Cannot create epoll instance\n");
 884
 885                 pipe_event.data.fd = intr_pipe.readfd;
 886                 /**
 887                  * add pipe fd into wait list, this pipe is used to
 888                  * rebuild the wait list.
 889                  */
 890                 if (epoll_ctl(pfd, EPOLL_CTL_ADD, intr_pipe.readfd,
 891                                                 &pipe_event) < 0) {
 892                         rte_panic("Error adding fd to %d epoll_ctl, %s\n",
 893                                         intr_pipe.readfd, strerror(errno));
 894                 }
 895                 numfds++;
 896
 897                 rte_spinlock_lock(&intr_lock);
 898
 899                 TAILQ_FOREACH(src, &intr_sources, next) {
 900                         if (src->callbacks.tqh_first == NULL)
 901                                 continue; /* skip those with no callbacks */
 902                         ev.events = EPOLLIN | EPOLLPRI | EPOLLRDHUP | EPOLLHUP;
 903                         ev.data.fd = src->intr_handle.fd;
 904
 905                         /**
 906                          * add all the uio device file descriptor
 907                          * into wait list.
 908                          */
 909                         if (epoll_ctl(pfd, EPOLL_CTL_ADD,
 910                                         src->intr_handle.fd, &ev) < 0){
 911                                 rte_panic("Error adding fd %d epoll_ctl, %s\n",
 912                                         src->intr_handle.fd, strerror(errno));
 913                         }
 914                         else
 915                                 numfds++;
 916                 }
 917                 rte_spinlock_unlock(&intr_lock);
 918                 /* serve the interrupt */
 919                 eal_intr_handle_interrupts(pfd, numfds);
 920
 921                 /**
 922                  * when we return, we need to rebuild the
 923                  * list of fds to monitor.
 924                  */
 925                 close(pfd);
 926         }
 927 }
 928
 929 int
 930 rte_eal_intr_init(void)
 931 {
 932         int ret = 0;
 933
 934         /* init the global interrupt source head */
 935         TAILQ_INIT(&intr_sources);
 936
 937         /**
 938          * create a pipe which will be waited by epoll and notified to
 939          * rebuild the wait list of epoll.
 940          */
 941         if (pipe(intr_pipe.pipefd) < 0) {
 942                 rte_errno = errno;
 943                 return -1;
 944         }
 945
 946         /* create the host thread to wait/handle the interrupt */
 947         ret = rte_ctrl_thread_create(&intr_thread, "eal-intr-thread", NULL,
 948                         eal_intr_thread_main, NULL);
 949         if (ret != 0) {
 950                 rte_errno = -ret;
 951                 RTE_LOG(ERR, EAL,
 952                         "Failed to create thread for interrupt handling\n");
 953         }
 954
 955         return ret;
 956 }
 957
 958 static void
 959 eal_intr_proc_rxtx_intr(int fd, const struct rte_intr_handle *intr_handle)
 960 {
 961         union rte_intr_read_buffer buf;
 962         int bytes_read = 0;
 963         int nbytes;
 964
 965         switch (intr_handle->type) {
 966         case RTE_INTR_HANDLE_UIO:
 967         case RTE_INTR_HANDLE_UIO_INTX:
 968                 bytes_read = sizeof(buf.uio_intr_count);
 969                 break;
 970 #ifdef VFIO_PRESENT
 971         case RTE_INTR_HANDLE_VFIO_MSIX:
 972         case RTE_INTR_HANDLE_VFIO_MSI:
 973         case RTE_INTR_HANDLE_VFIO_LEGACY:
 974                 bytes_read = sizeof(buf.vfio_intr_count);
 975                 break;
 976 #endif
 977         case RTE_INTR_HANDLE_VDEV:
 978                 bytes_read = intr_handle->efd_counter_size;
 979                 /* For vdev, number of bytes to read is set by driver */
 980                 break;
 981         case RTE_INTR_HANDLE_EXT:
 982                 return;
 983         default:
 984                 bytes_read = 1;
 985                 RTE_LOG(INFO, EAL, "unexpected intr type\n");
 986                 break;
 987         }
 988
 989         /**
 990          * read out to clear the ready-to-be-read flag
 991          * for epoll_wait.
 992          */
 993         if (bytes_read == 0)
 994                 return;
 995         do {
 996                 nbytes = read(fd, &buf, bytes_read);
 997                 if (nbytes < 0) {
 998                         if (errno == EINTR || errno == EWOULDBLOCK ||
 999                             errno == EAGAIN)
1000                                 continue;
1001                         RTE_LOG(ERR, EAL,
1002                                 "Error reading from fd %d: %s\n",
1003                                 fd, strerror(errno));
1004                 } else if (nbytes == 0)
1005                         RTE_LOG(ERR, EAL, "Read nothing from fd %d\n", fd);
1006                 return;
1007         } while (1);
1008 }
1009
1010 static int
1011 eal_epoll_process_event(struct epoll_event *evs, unsigned int n,
1012                         struct rte_epoll_event *events)
1013 {
1014         unsigned int i, count = 0;
1015         struct rte_epoll_event *rev;
1016
1017         for (i = 0; i < n; i++) {
1018                 rev = evs[i].data.ptr;
1019                 if (!rev || !rte_atomic32_cmpset(&rev->status, RTE_EPOLL_VALID,
1020                                                  RTE_EPOLL_EXEC))
1021                         continue;
1022
1023                 events[count].status        = RTE_EPOLL_VALID;
1024                 events[count].fd            = rev->fd;
1025                 events[count].epfd          = rev->epfd;
1026                 events[count].epdata.event  = rev->epdata.event;
1027                 events[count].epdata.data   = rev->epdata.data;
1028                 if (rev->epdata.cb_fun)
1029                         rev->epdata.cb_fun(rev->fd,
1030                                            rev->epdata.cb_arg);
1031
1032                 rte_compiler_barrier();
1033                 rev->status = RTE_EPOLL_VALID;
1034                 count++;
1035         }
1036         return count;
1037 }
1038
1039 static inline int
1040 eal_init_tls_epfd(void)
1041 {
1042         int pfd = epoll_create(255);
1043
1044         if (pfd < 0) {
1045                 RTE_LOG(ERR, EAL,
1046                         "Cannot create epoll instance\n");
1047                 return -1;
1048         }
1049         return pfd;
1050 }
1051
1052 int
1053 rte_intr_tls_epfd(void)
1054 {
1055         if (RTE_PER_LCORE(_epfd) == -1)
1056                 RTE_PER_LCORE(_epfd) = eal_init_tls_epfd();
1057
1058         return RTE_PER_LCORE(_epfd);
1059 }
1060
1061 int
1062 rte_epoll_wait(int epfd, struct rte_epoll_event *events,
1063                int maxevents, int timeout)
1064 {
1065         struct epoll_event evs[maxevents];
1066         int rc;
1067
1068         if (!events) {
1069                 RTE_LOG(ERR, EAL, "rte_epoll_event can't be NULL\n");
1070                 return -1;
1071         }
1072
1073         /* using per thread epoll fd */
1074         if (epfd == RTE_EPOLL_PER_THREAD)
1075                 epfd = rte_intr_tls_epfd();
1076
1077         while (1) {
1078                 rc = epoll_wait(epfd, evs, maxevents, timeout);
1079                 if (likely(rc > 0)) {
1080                         /* epoll_wait has at least one fd ready to read */
1081                         rc = eal_epoll_process_event(evs, rc, events);
1082                         break;
1083                 } else if (rc < 0) {
1084                         if (errno == EINTR)
1085                                 continue;
1086                         /* epoll_wait fail */
1087                         RTE_LOG(ERR, EAL, "epoll_wait returns with fail %s\n",
1088                                 strerror(errno));
1089                         rc = -1;
1090                         break;
1091                 } else {
1092                         /* rc == 0, epoll_wait timed out */
1093                         break;
1094                 }
1095         }
1096
1097         return rc;
1098 }
1099
1100 static inline void
1101 eal_epoll_data_safe_free(struct rte_epoll_event *ev)
1102 {
1103         while (!rte_atomic32_cmpset(&ev->status, RTE_EPOLL_VALID,
1104                                     RTE_EPOLL_INVALID))
1105                 while (ev->status != RTE_EPOLL_VALID)
1106                         rte_pause();
1107         memset(&ev->epdata, 0, sizeof(ev->epdata));
1108         ev->fd = -1;
1109         ev->epfd = -1;
1110 }
1111
1112 int
1113 rte_epoll_ctl(int epfd, int op, int fd,
1114               struct rte_epoll_event *event)
1115 {
1116         struct epoll_event ev;
1117
1118         if (!event) {
1119                 RTE_LOG(ERR, EAL, "rte_epoll_event can't be NULL\n");
1120                 return -1;
1121         }
1122
1123         /* using per thread epoll fd */
1124         if (epfd == RTE_EPOLL_PER_THREAD)
1125                 epfd = rte_intr_tls_epfd();
1126
1127         if (op == EPOLL_CTL_ADD) {
1128                 event->status = RTE_EPOLL_VALID;
1129                 event->fd = fd;  /* ignore fd in event */
1130                 event->epfd = epfd;
1131                 ev.data.ptr = (void *)event;
1132         }
1133
1134         ev.events = event->epdata.event;
1135         if (epoll_ctl(epfd, op, fd, &ev) < 0) {
1136                 RTE_LOG(ERR, EAL, "Error op %d fd %d epoll_ctl, %s\n",
1137                         op, fd, strerror(errno));
1138                 if (op == EPOLL_CTL_ADD)
1139                         /* rollback status when CTL_ADD fail */
1140                         event->status = RTE_EPOLL_INVALID;
1141                 return -1;
1142         }
1143
1144         if (op == EPOLL_CTL_DEL && event->status != RTE_EPOLL_INVALID)
1145                 eal_epoll_data_safe_free(event);
1146
1147         return 0;
1148 }
1149
1150 int
1151 rte_intr_rx_ctl(struct rte_intr_handle *intr_handle, int epfd,
1152                 int op, unsigned int vec, void *data)
1153 {
1154         struct rte_epoll_event *rev;
1155         struct rte_epoll_data *epdata;
1156         int epfd_op;
1157         unsigned int efd_idx;
1158         int rc = 0;
1159
1160         efd_idx = (vec >= RTE_INTR_VEC_RXTX_OFFSET) ?
1161                 (vec - RTE_INTR_VEC_RXTX_OFFSET) : vec;
1162
1163         if (!intr_handle || intr_handle->nb_efd == 0 ||
1164             efd_idx >= intr_handle->nb_efd) {
1165                 RTE_LOG(ERR, EAL, "Wrong intr vector number.\n");
1166                 return -EPERM;
1167         }
1168
1169         switch (op) {
1170         case RTE_INTR_EVENT_ADD:
1171                 epfd_op = EPOLL_CTL_ADD;
1172                 rev = &intr_handle->elist[efd_idx];
1173                 if (rev->status != RTE_EPOLL_INVALID) {
1174                         RTE_LOG(INFO, EAL, "Event already been added.\n");
1175                         return -EEXIST;
1176                 }
1177
1178                 /* attach to intr vector fd */
1179                 epdata = &rev->epdata;
1180                 epdata->event  = EPOLLIN | EPOLLPRI | EPOLLET;
1181                 epdata->data   = data;
1182                 epdata->cb_fun = (rte_intr_event_cb_t)eal_intr_proc_rxtx_intr;
1183                 epdata->cb_arg = (void *)intr_handle;
1184                 rc = rte_epoll_ctl(epfd, epfd_op,
1185                                    intr_handle->efds[efd_idx], rev);
1186                 if (!rc)
1187                         RTE_LOG(DEBUG, EAL,
1188                                 "efd %d associated with vec %d added on epfd %d"
1189                                 "\n", rev->fd, vec, epfd);
1190                 else
1191                         rc = -EPERM;
1192                 break;
1193         case RTE_INTR_EVENT_DEL:
1194                 epfd_op = EPOLL_CTL_DEL;
1195                 rev = &intr_handle->elist[efd_idx];
1196                 if (rev->status == RTE_EPOLL_INVALID) {
1197                         RTE_LOG(INFO, EAL, "Event does not exist.\n");
1198                         return -EPERM;
1199                 }
1200
1201                 rc = rte_epoll_ctl(rev->epfd, epfd_op, rev->fd, rev);
1202                 if (rc)
1203                         rc = -EPERM;
1204                 break;
1205         default:
1206                 RTE_LOG(ERR, EAL, "event op type mismatch\n");
1207                 rc = -EPERM;
1208         }
1209
1210         return rc;
1211 }
1212
1213 void
1214 rte_intr_free_epoll_fd(struct rte_intr_handle *intr_handle)
1215 {
1216         uint32_t i;
1217         struct rte_epoll_event *rev;
1218
1219         for (i = 0; i < intr_handle->nb_efd; i++) {
1220                 rev = &intr_handle->elist[i];
1221                 if (rev->status == RTE_EPOLL_INVALID)
1222                         continue;
1223                 if (rte_epoll_ctl(rev->epfd, EPOLL_CTL_DEL, rev->fd, rev)) {
1224                         /* force free if the entry valid */
1225                         eal_epoll_data_safe_free(rev);
1226                         rev->status = RTE_EPOLL_INVALID;
1227                 }
1228         }
1229 }
1230
1231 int
1232 rte_intr_efd_enable(struct rte_intr_handle *intr_handle, uint32_t nb_efd)
1233 {
1234         uint32_t i;
1235         int fd;
1236         uint32_t n = RTE_MIN(nb_efd, (uint32_t)RTE_MAX_RXTX_INTR_VEC_ID);
1237
1238         assert(nb_efd != 0);
1239
1240         if (intr_handle->type == RTE_INTR_HANDLE_VFIO_MSIX) {
1241                 for (i = 0; i < n; i++) {
1242                         fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
1243                         if (fd < 0) {
1244                                 RTE_LOG(ERR, EAL,
1245                                         "can't setup eventfd, error %i (%s)\n",
1246                                         errno, strerror(errno));
1247                                 return -errno;
1248                         }
1249                         intr_handle->efds[i] = fd;
1250                 }
1251                 intr_handle->nb_efd   = n;
1252                 intr_handle->max_intr = NB_OTHER_INTR + n;
1253         } else if (intr_handle->type == RTE_INTR_HANDLE_VDEV) {
1254                 /* only check, initialization would be done in vdev driver.*/
1255                 if (intr_handle->efd_counter_size >
1256                     sizeof(union rte_intr_read_buffer)) {
1257                         RTE_LOG(ERR, EAL, "the efd_counter_size is oversized");
1258                         return -EINVAL;
1259                 }
1260         } else {
1261                 intr_handle->efds[0]  = intr_handle->fd;
1262                 intr_handle->nb_efd   = RTE_MIN(nb_efd, 1U);
1263                 intr_handle->max_intr = NB_OTHER_INTR;
1264         }
1265
1266         return 0;
1267 }
1268
1269 void
1270 rte_intr_efd_disable(struct rte_intr_handle *intr_handle)
1271 {
1272         uint32_t i;
1273
1274         rte_intr_free_epoll_fd(intr_handle);
1275         if (intr_handle->max_intr > intr_handle->nb_efd) {
1276                 for (i = 0; i < intr_handle->nb_efd; i++)
1277                         close(intr_handle->efds[i]);
1278         }
1279         intr_handle->nb_efd = 0;
1280         intr_handle->max_intr = 0;
1281 }
1282
1283 int
1284 rte_intr_dp_is_en(struct rte_intr_handle *intr_handle)
1285 {
1286         return !(!intr_handle->nb_efd);
1287 }
1288
1289 int
1290 rte_intr_allow_others(struct rte_intr_handle *intr_handle)
1291 {
1292         if (!rte_intr_dp_is_en(intr_handle))
1293                 return 1;
1294         else
1295                 return !!(intr_handle->max_intr - intr_handle->nb_efd);
1296 }
1297
1298 int
1299 rte_intr_cap_multiple(struct rte_intr_handle *intr_handle)
1300 {
1301         if (intr_handle->type == RTE_INTR_HANDLE_VFIO_MSIX)
1302                 return 1;
1303
1304         if (intr_handle->type == RTE_INTR_HANDLE_VDEV)
1305                 return 1;
1306
1307         return 0;
1308 }