lib/librte_eal/common/eal_common_dev.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   Copyright(c) 2014 6WIND S.A.
   6  *   All rights reserved.
   7  *
   8  *   Redistribution and use in source and binary forms, with or without
   9  *   modification, are permitted provided that the following conditions
  10  *   are met:
  11  *
  12  *     * Redistributions of source code must retain the above copyright
  13  *       notice, this list of conditions and the following disclaimer.
  14  *     * Redistributions in binary form must reproduce the above copyright
  15  *       notice, this list of conditions and the following disclaimer in
  16  *       the documentation and/or other materials provided with the
  17  *       distribution.
  18  *     * Neither the name of Intel Corporation nor the names of its
  19  *       contributors may be used to endorse or promote products derived
  20  *       from this software without specific prior written permission.
  21  *
  22  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  25  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  26  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  27  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  28  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  32  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <inttypes.h>
  38 #include <sys/queue.h>
  39
  40 #include <rte_dev.h>
  41 #include <rte_devargs.h>
  42 #include <rte_debug.h>
  43 #include <rte_devargs.h>
  44 #include <rte_log.h>
  45
  46 #include "eal_private.h"
  47
  48 /** Global list of device drivers. */
  49 static struct rte_driver_list dev_driver_list =
  50         TAILQ_HEAD_INITIALIZER(dev_driver_list);
  51
  52 /* register a driver */
  53 void
  54 rte_eal_driver_register(struct rte_driver *driver)
  55 {
  56         TAILQ_INSERT_TAIL(&dev_driver_list, driver, next);
  57 }
  58
  59 /* unregister a driver */
  60 void
  61 rte_eal_driver_unregister(struct rte_driver *driver)
  62 {
  63         TAILQ_REMOVE(&dev_driver_list, driver, next);
  64 }
  65
  66 int
  67 rte_eal_vdev_init(const char *name, const char *args)
  68 {
  69         struct rte_driver *driver;
  70
  71         if (name == NULL)
  72                 return -EINVAL;
  73
  74         TAILQ_FOREACH(driver, &dev_driver_list, next) {
  75                 if (driver->type != PMD_VDEV)
  76                         continue;
  77
  78                 /*
  79                  * search a driver prefix in virtual device name.
  80                  * For example, if the driver is pcap PMD, driver->name
  81                  * will be "eth_pcap", but "name" will be "eth_pcapN".
  82                  * So use strncmp to compare.
  83                  */
  84                 if (!strncmp(driver->name, name, strlen(driver->name)))
  85                         return driver->init(name, args);
  86         }
  87
  88         RTE_LOG(ERR, EAL, "no driver found for %s\n", name);
  89         return -EINVAL;
  90 }
  91
  92 int
  93 rte_eal_dev_init(void)
  94 {
  95         struct rte_devargs *devargs;
  96         struct rte_driver *driver;
  97
  98         /*
  99          * Note that the dev_driver_list is populated here
 100          * from calls made to rte_eal_driver_register from constructor functions
 101          * embedded into PMD modules via the PMD_REGISTER_DRIVER macro
 102          */
 103
 104         /* call the init function for each virtual device */
 105         TAILQ_FOREACH(devargs, &devargs_list, next) {
 106
 107                 if (devargs->type != RTE_DEVTYPE_VIRTUAL)
 108                         continue;
 109
 110                 if (rte_eal_vdev_init(devargs->virt.drv_name,
 111                                         devargs->args)) {
 112                         RTE_LOG(ERR, EAL, "failed to initialize %s device\n",
 113                                         devargs->virt.drv_name);
 114                         return -1;
 115                 }
 116         }
 117
 118         /* Once the vdevs are initalized, start calling all the pdev drivers */
 119         TAILQ_FOREACH(driver, &dev_driver_list, next) {
 120                 if (driver->type != PMD_PDEV)
 121                         continue;
 122                 /* PDEV drivers don't get passed any parameters */
 123                 driver->init(NULL, NULL);
 124         }
 125         return 0;
 126 }
 127
 128 int
 129 rte_eal_vdev_uninit(const char *name)
 130 {
 131         struct rte_driver *driver;
 132
 133         if (name == NULL)
 134                 return -EINVAL;
 135
 136         TAILQ_FOREACH(driver, &dev_driver_list, next) {
 137                 if (driver->type != PMD_VDEV)
 138                         continue;
 139
 140                 /*
 141                  * search a driver prefix in virtual device name.
 142                  * For example, if the driver is pcap PMD, driver->name
 143                  * will be "eth_pcap", but "name" will be "eth_pcapN".
 144                  * So use strncmp to compare.
 145                  */
 146                 if (!strncmp(driver->name, name, strlen(driver->name)))
 147                         return driver->uninit(name);
 148         }
 149
 150         RTE_LOG(ERR, EAL, "no driver found for %s\n", name);
 151         return -EINVAL;
 152 }