ceph/src/seastar/dpdk/lib/librte_eal/common/include/rte_vdev.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2016 RehiveTech. All rights reserved.
   5  *
   6  *   Redistribution and use in source and binary forms, with or without
   7  *   modification, are permitted provided that the following conditions
   8  *   are met:
   9  *
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above copyright
  13  *       notice, this list of conditions and the following disclaimer in
  14  *       the documentation and/or other materials provided with the
  15  *       distribution.
  16  *     * Neither the name of RehiveTech nor the names of its
  17  *       contributors may be used to endorse or promote products derived
  18  *       from this software without specific prior written permission.
  19  *
  20  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  23  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  24  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  30  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #ifndef RTE_VDEV_H
  34 #define RTE_VDEV_H
  35
  36 #ifdef __cplusplus
  37 extern "C" {
  38 #endif
  39
  40 #include <sys/queue.h>
  41 #include <rte_dev.h>
  42 #include <rte_devargs.h>
  43
  44 struct rte_vdev_device {
  45         TAILQ_ENTRY(rte_vdev_device) next;      /**< Next attached vdev */
  46         struct rte_device device;               /**< Inherit core device */
  47 };
  48
  49 static inline const char *
  50 rte_vdev_device_name(const struct rte_vdev_device *dev)
  51 {
  52         if (dev && dev->device.devargs)
  53                 return dev->device.devargs->virt.drv_name;
  54         return NULL;
  55 }
  56
  57 static inline const char *
  58 rte_vdev_device_args(const struct rte_vdev_device *dev)
  59 {
  60         if (dev && dev->device.devargs)
  61                 return dev->device.devargs->args;
  62         return "";
  63 }
  64
  65 /** Double linked list of virtual device drivers. */
  66 TAILQ_HEAD(vdev_driver_list, rte_vdev_driver);
  67
  68 /**
  69  * Probe function called for each virtual device driver once.
  70  */
  71 typedef int (rte_vdev_probe_t)(struct rte_vdev_device *dev);
  72
  73 /**
  74  * Remove function called for each virtual device driver once.
  75  */
  76 typedef int (rte_vdev_remove_t)(struct rte_vdev_device *dev);
  77
  78 /**
  79  * A virtual device driver abstraction.
  80  */
  81 struct rte_vdev_driver {
  82         TAILQ_ENTRY(rte_vdev_driver) next; /**< Next in list. */
  83         struct rte_driver driver;      /**< Inherited general driver. */
  84         rte_vdev_probe_t *probe;       /**< Virtual device probe function. */
  85         rte_vdev_remove_t *remove;     /**< Virtual device remove function. */
  86 };
  87
  88 /**
  89  * Register a virtual device driver.
  90  *
  91  * @param driver
  92  *   A pointer to a rte_vdev_driver structure describing the driver
  93  *   to be registered.
  94  */
  95 void rte_vdev_register(struct rte_vdev_driver *driver);
  96
  97 /**
  98  * Unregister a virtual device driver.
  99  *
 100  * @param driver
 101  *   A pointer to a rte_vdev_driver structure describing the driver
 102  *   to be unregistered.
 103  */
 104 void rte_vdev_unregister(struct rte_vdev_driver *driver);
 105
 106 #define RTE_PMD_REGISTER_VDEV(nm, vdrv)\
 107 RTE_INIT(vdrvinitfn_ ##vdrv);\
 108 static const char *vdrvinit_ ## nm ## _alias;\
 109 static void vdrvinitfn_ ##vdrv(void)\
 110 {\
 111         (vdrv).driver.name = RTE_STR(nm);\
 112         (vdrv).driver.alias = vdrvinit_ ## nm ## _alias;\
 113         rte_vdev_register(&vdrv);\
 114 } \
 115 RTE_PMD_EXPORT_NAME(nm, __COUNTER__)
 116
 117 #define RTE_PMD_REGISTER_ALIAS(nm, alias)\
 118 static const char *vdrvinit_ ## nm ## _alias = RTE_STR(alias)
 119
 120 #ifdef __cplusplus
 121 }
 122 #endif
 123
 124 #endif