lib/librte_ethdev/rte_class_eth.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2018 Gaëtan Rivet
   3  */
   4
   5 #include <string.h>
   6
   7 #include <rte_class.h>
   8 #include <rte_compat.h>
   9 #include <rte_errno.h>
  10 #include <rte_kvargs.h>
  11 #include <rte_log.h>
  12
  13 #include "rte_ethdev.h"
  14 #include "rte_ethdev_core.h"
  15 #include "ethdev_private.h"
  16
  17 enum eth_params {
  18         RTE_ETH_PARAMS_MAX,
  19 };
  20
  21 static const char * const eth_params_keys[] = {
  22         [RTE_ETH_PARAMS_MAX] = NULL,
  23 };
  24
  25 struct eth_dev_match_arg {
  26         struct rte_device *device;
  27         struct rte_kvargs *kvlist;
  28 };
  29
  30 #define eth_dev_match_arg(d, k) \
  31         (&(const struct eth_dev_match_arg) { \
  32                 .device = (d), \
  33                 .kvlist = (k), \
  34         })
  35
  36 static int
  37 eth_dev_match(const struct rte_eth_dev *edev,
  38               const void *_arg)
  39 {
  40         const struct eth_dev_match_arg *arg = _arg;
  41         const struct rte_kvargs *kvlist = arg->kvlist;
  42
  43         if (edev->state == RTE_ETH_DEV_UNUSED)
  44                 return -1;
  45         if (edev->device != arg->device)
  46                 return -1;
  47         if (kvlist == NULL)
  48                 /* Empty string matches everything. */
  49                 return 0;
  50         return 0;
  51 }
  52
  53 static void *
  54 eth_dev_iterate(const void *start,
  55                 const char *str,
  56                 const struct rte_dev_iterator *it)
  57 {
  58         struct rte_kvargs *kvargs = NULL;
  59         struct rte_eth_dev *edev = NULL;
  60
  61         if (str != NULL) {
  62                 kvargs = rte_kvargs_parse(str, eth_params_keys);
  63                 if (kvargs == NULL) {
  64                         RTE_LOG(ERR, EAL, "cannot parse argument list\n");
  65                         rte_errno = EINVAL;
  66                         return NULL;
  67                 }
  68         }
  69         edev = eth_find_device(start, eth_dev_match,
  70                                eth_dev_match_arg(it->device, kvargs));
  71         rte_kvargs_free(kvargs);
  72         return edev;
  73 }
  74
  75 struct rte_class rte_class_eth = {
  76         .dev_iterate = eth_dev_iterate,
  77 };
  78
  79 RTE_REGISTER_CLASS(eth, rte_class_eth);