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 <string.h>
  36 #include <inttypes.h>
  37 #include <sys/queue.h>
  38
  39 #include <rte_dev.h>
  40 #include <rte_devargs.h>
  41 #include <rte_debug.h>
  42 #include <rte_devargs.h>
  43
  44 #include "eal_private.h"
  45
  46 /** Global list of device drivers. */
  47 static struct rte_driver_list dev_driver_list =
  48         TAILQ_HEAD_INITIALIZER(dev_driver_list);
  49
  50 /* register a driver */
  51 void
  52 rte_eal_driver_register(struct rte_driver *driver)
  53 {
  54         TAILQ_INSERT_TAIL(&dev_driver_list, driver, next);
  55 }
  56
  57 /* unregister a driver */
  58 void
  59 rte_eal_driver_unregister(struct rte_driver *driver)
  60 {
  61         TAILQ_REMOVE(&dev_driver_list, driver, next);
  62 }
  63
  64 int
  65 rte_eal_dev_init(void)
  66 {
  67         struct rte_devargs *devargs;
  68         struct rte_driver *driver;
  69
  70         /*
  71          * Note that the dev_driver_list is populated here
  72          * from calls made to rte_eal_driver_register from constructor functions
  73          * embedded into PMD modules via the PMD_REGISTER_DRIVER macro
  74          */
  75
  76         /* call the init function for each virtual device */
  77         TAILQ_FOREACH(devargs, &devargs_list, next) {
  78
  79                 if (devargs->type != RTE_DEVTYPE_VIRTUAL)
  80                         continue;
  81
  82                 TAILQ_FOREACH(driver, &dev_driver_list, next) {
  83                         if (driver->type != PMD_VDEV)
  84                                 continue;
  85
  86                         /* search a driver prefix in virtual device name */
  87                         if (!strncmp(driver->name, devargs->virtual.drv_name,
  88                                         strlen(driver->name))) {
  89                                 driver->init(devargs->virtual.drv_name,
  90                                         devargs->args);
  91                                 break;
  92                         }
  93                 }
  94
  95                 if (driver == NULL) {
  96                         rte_panic("no driver found for %s\n",
  97                                   devargs->virtual.drv_name);
  98                 }
  99         }
 100
 101         /* Once the vdevs are initalized, start calling all the pdev drivers */
 102         TAILQ_FOREACH(driver, &dev_driver_list, next) {
 103                 if (driver->type != PMD_PDEV)
 104                         continue;
 105                 /* PDEV drivers don't get passed any parameters */
 106                 driver->init(NULL, NULL);
 107         }
 108         return 0;
 109 }