lib/librte_ethdev/ethdev_private.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2018 Gaëtan Rivet
   3  */
   4
   5 #include "rte_ethdev.h"
   6 #include "ethdev_private.h"
   7
   8 uint16_t
   9 eth_dev_to_id(const struct rte_eth_dev *dev)
  10 {
  11         if (dev == NULL)
  12                 return RTE_MAX_ETHPORTS;
  13         return dev - rte_eth_devices;
  14 }
  15
  16 struct rte_eth_dev *
  17 eth_find_device(const struct rte_eth_dev *start, rte_eth_cmp_t cmp,
  18                 const void *data)
  19 {
  20         struct rte_eth_dev *edev;
  21         ptrdiff_t idx;
  22
  23         /* Avoid Undefined Behaviour */
  24         if (start != NULL &&
  25             (start < &rte_eth_devices[0] ||
  26              start > &rte_eth_devices[RTE_MAX_ETHPORTS]))
  27                 return NULL;
  28         if (start != NULL)
  29                 idx = eth_dev_to_id(start) + 1;
  30         else
  31                 idx = 0;
  32         for (; idx < RTE_MAX_ETHPORTS; idx++) {
  33                 edev = &rte_eth_devices[idx];
  34                 if (cmp(edev, data) == 0)
  35                         return edev;
  36         }
  37         return NULL;
  38 }
  39