ceph/src/seastar/dpdk/drivers/bus/pci/pci_params.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2018 Gaëtan Rivet
   3  */
   4
   5 #include <rte_bus.h>
   6 #include <rte_bus_pci.h>
   7 #include <rte_dev.h>
   8 #include <rte_errno.h>
   9 #include <rte_kvargs.h>
  10 #include <rte_pci.h>
  11
  12 #include "private.h"
  13
  14 enum pci_params {
  15         RTE_PCI_PARAM_ADDR,
  16         RTE_PCI_PARAM_MAX,
  17 };
  18
  19 static const char * const pci_params_keys[] = {
  20         [RTE_PCI_PARAM_ADDR] = "addr",
  21         [RTE_PCI_PARAM_MAX] = NULL,
  22 };
  23
  24 static int
  25 pci_addr_kv_cmp(const char *key __rte_unused,
  26                 const char *value,
  27                 void *_addr2)
  28 {
  29         struct rte_pci_addr _addr1;
  30         struct rte_pci_addr *addr1 = &_addr1;
  31         struct rte_pci_addr *addr2 = _addr2;
  32
  33         if (rte_pci_addr_parse(value, addr1))
  34                 return -1;
  35         return -abs(rte_pci_addr_cmp(addr1, addr2));
  36 }
  37
  38 static int
  39 pci_dev_match(const struct rte_device *dev,
  40               const void *_kvlist)
  41 {
  42         const struct rte_kvargs *kvlist = _kvlist;
  43         const struct rte_pci_device *pdev;
  44
  45         if (kvlist == NULL)
  46                 /* Empty string matches everything. */
  47                 return 0;
  48         pdev = RTE_DEV_TO_PCI_CONST(dev);
  49         /* if any field does not match. */
  50         if (rte_kvargs_process(kvlist, pci_params_keys[RTE_PCI_PARAM_ADDR],
  51                                &pci_addr_kv_cmp,
  52                                (void *)(intptr_t)&pdev->addr))
  53                 return 1;
  54         return 0;
  55 }
  56
  57 void *
  58 rte_pci_dev_iterate(const void *start,
  59                     const char *str,
  60                     const struct rte_dev_iterator *it __rte_unused)
  61 {
  62         rte_bus_find_device_t find_device;
  63         struct rte_kvargs *kvargs = NULL;
  64         struct rte_device *dev;
  65
  66         if (str != NULL) {
  67                 kvargs = rte_kvargs_parse(str, pci_params_keys);
  68                 if (kvargs == NULL) {
  69                         RTE_LOG(ERR, EAL, "cannot parse argument list\n");
  70                         rte_errno = EINVAL;
  71                         return NULL;
  72                 }
  73         }
  74         find_device = rte_pci_bus.bus.find_device;
  75         dev = find_device(start, pci_dev_match, kvargs);
  76         rte_kvargs_free(kvargs);
  77         return dev;
  78 }