ceph/src/spdk/dpdk/lib/librte_eal/include/rte_eal_interrupts.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #ifndef _RTE_INTERRUPTS_H_
   6 #error "don't include this file directly, please include generic <rte_interrupts.h>"
   7 #endif
   8
   9 /**
  10  * @file rte_eal_interrupts.h
  11  * @internal
  12  *
  13  * Contains function prototypes exposed by the EAL for interrupt handling by
  14  * drivers and other DPDK internal consumers.
  15  */
  16
  17 #ifndef _RTE_EAL_INTERRUPTS_H_
  18 #define _RTE_EAL_INTERRUPTS_H_
  19
  20 #define RTE_MAX_RXTX_INTR_VEC_ID      512
  21 #define RTE_INTR_VEC_ZERO_OFFSET      0
  22 #define RTE_INTR_VEC_RXTX_OFFSET      1
  23
  24 /**
  25  * The interrupt source type, e.g. UIO, VFIO, ALARM etc.
  26  */
  27 enum rte_intr_handle_type {
  28         RTE_INTR_HANDLE_UNKNOWN = 0,  /**< generic unknown handle */
  29         RTE_INTR_HANDLE_UIO,          /**< uio device handle */
  30         RTE_INTR_HANDLE_UIO_INTX,     /**< uio generic handle */
  31         RTE_INTR_HANDLE_VFIO_LEGACY,  /**< vfio device handle (legacy) */
  32         RTE_INTR_HANDLE_VFIO_MSI,     /**< vfio device handle (MSI) */
  33         RTE_INTR_HANDLE_VFIO_MSIX,    /**< vfio device handle (MSIX) */
  34         RTE_INTR_HANDLE_ALARM,        /**< alarm handle */
  35         RTE_INTR_HANDLE_EXT,          /**< external handler */
  36         RTE_INTR_HANDLE_VDEV,         /**< virtual device */
  37         RTE_INTR_HANDLE_DEV_EVENT,    /**< device event handle */
  38         RTE_INTR_HANDLE_VFIO_REQ,     /**< VFIO request handle */
  39         RTE_INTR_HANDLE_MAX           /**< count of elements */
  40 };
  41
  42 #define RTE_INTR_EVENT_ADD            1UL
  43 #define RTE_INTR_EVENT_DEL            2UL
  44
  45 typedef void (*rte_intr_event_cb_t)(int fd, void *arg);
  46
  47 struct rte_epoll_data {
  48         uint32_t event;               /**< event type */
  49         void *data;                   /**< User data */
  50         rte_intr_event_cb_t cb_fun;   /**< IN: callback fun */
  51         void *cb_arg;                 /**< IN: callback arg */
  52 };
  53
  54 enum {
  55         RTE_EPOLL_INVALID = 0,
  56         RTE_EPOLL_VALID,
  57         RTE_EPOLL_EXEC,
  58 };
  59
  60 /** interrupt epoll event obj, taken by epoll_event.ptr */
  61 struct rte_epoll_event {
  62         volatile uint32_t status;  /**< OUT: event status */
  63         int fd;                    /**< OUT: event fd */
  64         int epfd;       /**< OUT: epoll instance the ev associated with */
  65         struct rte_epoll_data epdata;
  66 };
  67
  68 /** Handle for interrupts. */
  69 struct rte_intr_handle {
  70         RTE_STD_C11
  71         union {
  72                 int vfio_dev_fd;  /**< VFIO device file descriptor */
  73                 int uio_cfg_fd;  /**< UIO cfg file desc for uio_pci_generic */
  74         };
  75         int fd;  /**< interrupt event file descriptor */
  76         enum rte_intr_handle_type type;  /**< handle type */
  77         uint32_t max_intr;             /**< max interrupt requested */
  78         uint32_t nb_efd;               /**< number of available efd(event fd) */
  79         uint8_t efd_counter_size;      /**< size of efd counter, used for vdev */
  80         int efds[RTE_MAX_RXTX_INTR_VEC_ID];  /**< intr vectors/efds mapping */
  81         struct rte_epoll_event elist[RTE_MAX_RXTX_INTR_VEC_ID];
  82                                        /**< intr vector epoll event */
  83         int *intr_vec;                 /**< intr vector number array */
  84 };
  85
  86 #define RTE_EPOLL_PER_THREAD        -1  /**< to hint using per thread epfd */
  87
  88 /**
  89  * It waits for events on the epoll instance.
  90  *
  91  * @param epfd
  92  *   Epoll instance fd on which the caller wait for events.
  93  * @param events
  94  *   Memory area contains the events that will be available for the caller.
  95  * @param maxevents
  96  *   Up to maxevents are returned, must greater than zero.
  97  * @param timeout
  98  *   Specifying a timeout of -1 causes a block indefinitely.
  99  *   Specifying a timeout equal to zero cause to return immediately.
 100  * @return
 101  *   - On success, returns the number of available event.
 102  *   - On failure, a negative value.
 103  */
 104 int
 105 rte_epoll_wait(int epfd, struct rte_epoll_event *events,
 106                int maxevents, int timeout);
 107
 108 /**
 109  * It performs control operations on epoll instance referred by the epfd.
 110  * It requests that the operation op be performed for the target fd.
 111  *
 112  * @param epfd
 113  *   Epoll instance fd on which the caller perform control operations.
 114  * @param op
 115  *   The operation be performed for the target fd.
 116  * @param fd
 117  *   The target fd on which the control ops perform.
 118  * @param event
 119  *   Describes the object linked to the fd.
 120  *   Note: The caller must take care the object deletion after CTL_DEL.
 121  * @return
 122  *   - On success, zero.
 123  *   - On failure, a negative value.
 124  */
 125 int
 126 rte_epoll_ctl(int epfd, int op, int fd,
 127               struct rte_epoll_event *event);
 128
 129 /**
 130  * The function returns the per thread epoll instance.
 131  *
 132  * @return
 133  *   epfd the epoll instance referred to.
 134  */
 135 int
 136 rte_intr_tls_epfd(void);
 137
 138 /**
 139  * @param intr_handle
 140  *   Pointer to the interrupt handle.
 141  * @param epfd
 142  *   Epoll instance fd which the intr vector associated to.
 143  * @param op
 144  *   The operation be performed for the vector.
 145  *   Operation type of {ADD, DEL}.
 146  * @param vec
 147  *   RX intr vector number added to the epoll instance wait list.
 148  * @param data
 149  *   User raw data.
 150  * @return
 151  *   - On success, zero.
 152  *   - On failure, a negative value.
 153  */
 154 int
 155 rte_intr_rx_ctl(struct rte_intr_handle *intr_handle,
 156                 int epfd, int op, unsigned int vec, void *data);
 157
 158 /**
 159  * It deletes registered eventfds.
 160  *
 161  * @param intr_handle
 162  *   Pointer to the interrupt handle.
 163  */
 164 void
 165 rte_intr_free_epoll_fd(struct rte_intr_handle *intr_handle);
 166
 167 /**
 168  * It enables the packet I/O interrupt event if it's necessary.
 169  * It creates event fd for each interrupt vector when MSIX is used,
 170  * otherwise it multiplexes a single event fd.
 171  *
 172  * @param intr_handle
 173  *   Pointer to the interrupt handle.
 174  * @param nb_efd
 175  *   Number of interrupt vector trying to enable.
 176  *   The value 0 is not allowed.
 177  * @return
 178  *   - On success, zero.
 179  *   - On failure, a negative value.
 180  */
 181 int
 182 rte_intr_efd_enable(struct rte_intr_handle *intr_handle, uint32_t nb_efd);
 183
 184 /**
 185  * It disables the packet I/O interrupt event.
 186  * It deletes registered eventfds and closes the open fds.
 187  *
 188  * @param intr_handle
 189  *   Pointer to the interrupt handle.
 190  */
 191 void
 192 rte_intr_efd_disable(struct rte_intr_handle *intr_handle);
 193
 194 /**
 195  * The packet I/O interrupt on datapath is enabled or not.
 196  *
 197  * @param intr_handle
 198  *   Pointer to the interrupt handle.
 199  */
 200 int
 201 rte_intr_dp_is_en(struct rte_intr_handle *intr_handle);
 202
 203 /**
 204  * The interrupt handle instance allows other causes or not.
 205  * Other causes stand for any none packet I/O interrupts.
 206  *
 207  * @param intr_handle
 208  *   Pointer to the interrupt handle.
 209  */
 210 int
 211 rte_intr_allow_others(struct rte_intr_handle *intr_handle);
 212
 213 /**
 214  * The multiple interrupt vector capability of interrupt handle instance.
 215  * It returns zero if no multiple interrupt vector support.
 216  *
 217  * @param intr_handle
 218  *   Pointer to the interrupt handle.
 219  */
 220 int
 221 rte_intr_cap_multiple(struct rte_intr_handle *intr_handle);
 222
 223 /**
 224  * @warning
 225  * @b EXPERIMENTAL: this API may change without prior notice
 226  *
 227  * @internal
 228  * Check if currently executing in interrupt context
 229  *
 230  * @return
 231  *  - non zero in case of interrupt context
 232  *  - zero in case of process context
 233  */
 234 __rte_experimental
 235 int
 236 rte_thread_is_intr(void);
 237
 238 #endif /* _RTE_EAL_INTERRUPTS_H_ */