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_vdev.h>
  41 #include <rte_common.h>
  42
  43 struct vdev_driver_list vdev_driver_list =
  44         TAILQ_HEAD_INITIALIZER(vdev_driver_list);
  45
  46 /* register a driver */
  47 void
  48 rte_eal_vdrv_register(struct rte_vdev_driver *driver)
  49 {
  50         TAILQ_INSERT_TAIL(&vdev_driver_list, driver, next);
  51         rte_eal_driver_register(&driver->driver);
  52 }
  53
  54 /* unregister a driver */
  55 void
  56 rte_eal_vdrv_unregister(struct rte_vdev_driver *driver)
  57 {
  58         rte_eal_driver_unregister(&driver->driver);
  59         TAILQ_REMOVE(&vdev_driver_list, driver, next);
  60 }
  61
  62 int
  63 rte_eal_vdev_init(const char *name, const char *args)
  64 {
  65         struct rte_vdev_driver *driver;
  66
  67         if (name == NULL)
  68                 return -EINVAL;
  69
  70         TAILQ_FOREACH(driver, &vdev_driver_list, next) {
  71                 /*
  72                  * search a driver prefix in virtual device name.
  73                  * For example, if the driver is pcap PMD, driver->name
  74                  * will be "net_pcap", but "name" will be "net_pcapN".
  75                  * So use strncmp to compare.
  76                  */
  77                 if (!strncmp(driver->driver.name, name,
  78                             strlen(driver->driver.name)))
  79                         return driver->probe(name, args);
  80         }
  81
  82         /* Give new names precedence over aliases. */
  83         TAILQ_FOREACH(driver, &vdev_driver_list, next) {
  84                 if (driver->driver.alias &&
  85                     !strncmp(driver->driver.alias, name,
  86                             strlen(driver->driver.alias)))
  87                         return driver->probe(name, args);
  88         }
  89
  90         RTE_LOG(ERR, EAL, "no driver found for %s\n", name);
  91         return -EINVAL;
  92 }
  93
  94 int
  95 rte_eal_vdev_uninit(const char *name)
  96 {
  97         struct rte_vdev_driver *driver;
  98
  99         if (name == NULL)
 100                 return -EINVAL;
 101
 102         TAILQ_FOREACH(driver, &vdev_driver_list, next) {
 103                 /*
 104                  * search a driver prefix in virtual device name.
 105                  * For example, if the driver is pcap PMD, driver->name
 106                  * will be "net_pcap", but "name" will be "net_pcapN".
 107                  * So use strncmp to compare.
 108                  */
 109                 if (!strncmp(driver->driver.name, name,
 110                              strlen(driver->driver.name)))
 111                         return driver->remove(name);
 112         }
 113
 114         /* Give new names precedence over aliases. */
 115         TAILQ_FOREACH(driver, &vdev_driver_list, next) {
 116                 if (driver->driver.alias &&
 117                     !strncmp(driver->driver.alias, name,
 118                             strlen(driver->driver.alias)))
 119                         return driver->remove(name);
 120         }
 121
 122         RTE_LOG(ERR, EAL, "no driver found for %s\n", name);
 123         return -EINVAL;
 124 }