lib/librte_eal/common/eal_common_vdev.c

   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 #include <string.h>
  34 #include <inttypes.h>
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <stdint.h>
  38 #include <sys/queue.h>
  39
  40 #include <rte_eal.h>
  41 #include <rte_bus.h>
  42 #include <rte_vdev.h>
  43 #include <rte_common.h>
  44 #include <rte_devargs.h>
  45
  46 struct vdev_driver_list vdev_driver_list =
  47         TAILQ_HEAD_INITIALIZER(vdev_driver_list);
  48
  49 static void rte_vdev_bus_register(void);
  50
  51 /* register a driver */
  52 void
  53 rte_eal_vdrv_register(struct rte_vdev_driver *driver)
  54 {
  55         rte_vdev_bus_register();
  56
  57         TAILQ_INSERT_TAIL(&vdev_driver_list, driver, next);
  58         rte_eal_driver_register(&driver->driver);
  59 }
  60
  61 /* unregister a driver */
  62 void
  63 rte_eal_vdrv_unregister(struct rte_vdev_driver *driver)
  64 {
  65         rte_eal_driver_unregister(&driver->driver);
  66         TAILQ_REMOVE(&vdev_driver_list, driver, next);
  67 }
  68
  69 int
  70 rte_eal_vdev_init(const char *name, const char *args)
  71 {
  72         struct rte_vdev_driver *driver;
  73
  74         if (name == NULL)
  75                 return -EINVAL;
  76
  77         TAILQ_FOREACH(driver, &vdev_driver_list, next) {
  78                 /*
  79                  * search a driver prefix in virtual device name.
  80                  * For example, if the driver is pcap PMD, driver->name
  81                  * will be "net_pcap", but "name" will be "net_pcapN".
  82                  * So use strncmp to compare.
  83                  */
  84                 if (!strncmp(driver->driver.name, name,
  85                             strlen(driver->driver.name)))
  86                         return driver->probe(name, args);
  87         }
  88
  89         /* Give new names precedence over aliases. */
  90         TAILQ_FOREACH(driver, &vdev_driver_list, next) {
  91                 if (driver->driver.alias &&
  92                     !strncmp(driver->driver.alias, name,
  93                             strlen(driver->driver.alias)))
  94                         return driver->probe(name, args);
  95         }
  96
  97         RTE_LOG(ERR, EAL, "no driver found for %s\n", name);
  98         return -EINVAL;
  99 }
 100
 101 int
 102 rte_eal_vdev_uninit(const char *name)
 103 {
 104         struct rte_vdev_driver *driver;
 105
 106         if (name == NULL)
 107                 return -EINVAL;
 108
 109         TAILQ_FOREACH(driver, &vdev_driver_list, next) {
 110                 /*
 111                  * search a driver prefix in virtual device name.
 112                  * For example, if the driver is pcap PMD, driver->name
 113                  * will be "net_pcap", but "name" will be "net_pcapN".
 114                  * So use strncmp to compare.
 115                  */
 116                 if (!strncmp(driver->driver.name, name,
 117                              strlen(driver->driver.name)))
 118                         return driver->remove(name);
 119         }
 120
 121         /* Give new names precedence over aliases. */
 122         TAILQ_FOREACH(driver, &vdev_driver_list, next) {
 123                 if (driver->driver.alias &&
 124                     !strncmp(driver->driver.alias, name,
 125                             strlen(driver->driver.alias)))
 126                         return driver->remove(name);
 127         }
 128
 129         RTE_LOG(ERR, EAL, "no driver found for %s\n", name);
 130         return -EINVAL;
 131 }
 132
 133 static int
 134 vdev_scan(void)
 135 {
 136         /* for virtual devices we don't need to scan anything */
 137         return 0;
 138 }
 139
 140 static int
 141 vdev_probe(void)
 142 {
 143         struct rte_devargs *devargs;
 144
 145         /*
 146          * Note that the dev_driver_list is populated here
 147          * from calls made to rte_eal_driver_register from constructor functions
 148          * embedded into PMD modules via the RTE_PMD_REGISTER_VDEV macro
 149          */
 150
 151         /* call the init function for each virtual device */
 152         TAILQ_FOREACH(devargs, &devargs_list, next) {
 153
 154                 if (devargs->type != RTE_DEVTYPE_VIRTUAL)
 155                         continue;
 156
 157                 if (rte_eal_vdev_init(devargs->virt.drv_name,
 158                                       devargs->args)) {
 159                         RTE_LOG(ERR, EAL, "failed to initialize %s device\n",
 160                                 devargs->virt.drv_name);
 161                         return -1;
 162                 }
 163         }
 164
 165         return 0;
 166 }
 167
 168 static struct rte_bus rte_vdev_bus = {
 169         .scan = vdev_scan,
 170         .probe = vdev_probe,
 171 };
 172
 173 RTE_INIT(rte_vdev_bus_register);
 174
 175 static void rte_vdev_bus_register(void)
 176 {
 177         static int registered;
 178
 179         if (registered)
 180                 return;
 181
 182         registered = 1;
 183         rte_vdev_bus.name = RTE_STR(virtual);
 184         rte_bus_register(&rte_vdev_bus);
 185 }