lib/librte_vhost/vdpa.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2018 Intel Corporation
   3  */
   4
   5 /**
   6  * @file
   7  *
   8  * Device specific vhost lib
   9  */
  10
  11 #include <stdbool.h>
  12
  13 #include <rte_malloc.h>
  14 #include "rte_vdpa.h"
  15 #include "vhost.h"
  16
  17 static struct rte_vdpa_device *vdpa_devices[MAX_VHOST_DEVICE];
  18 static uint32_t vdpa_device_num;
  19
  20 static bool
  21 is_same_vdpa_device(struct rte_vdpa_dev_addr *a,
  22                 struct rte_vdpa_dev_addr *b)
  23 {
  24         bool ret = true;
  25
  26         if (a->type != b->type)
  27                 return false;
  28
  29         switch (a->type) {
  30         case PCI_ADDR:
  31                 if (a->pci_addr.domain != b->pci_addr.domain ||
  32                                 a->pci_addr.bus != b->pci_addr.bus ||
  33                                 a->pci_addr.devid != b->pci_addr.devid ||
  34                                 a->pci_addr.function != b->pci_addr.function)
  35                         ret = false;
  36                 break;
  37         default:
  38                 break;
  39         }
  40
  41         return ret;
  42 }
  43
  44 int
  45 rte_vdpa_register_device(struct rte_vdpa_dev_addr *addr,
  46                 struct rte_vdpa_dev_ops *ops)
  47 {
  48         struct rte_vdpa_device *dev;
  49         char device_name[MAX_VDPA_NAME_LEN];
  50         int i;
  51
  52         if (vdpa_device_num >= MAX_VHOST_DEVICE)
  53                 return -1;
  54
  55         for (i = 0; i < MAX_VHOST_DEVICE; i++) {
  56                 dev = vdpa_devices[i];
  57                 if (dev && is_same_vdpa_device(&dev->addr, addr))
  58                         return -1;
  59         }
  60
  61         for (i = 0; i < MAX_VHOST_DEVICE; i++) {
  62                 if (vdpa_devices[i] == NULL)
  63                         break;
  64         }
  65
  66         sprintf(device_name, "vdpa-dev-%d", i);
  67         dev = rte_zmalloc(device_name, sizeof(struct rte_vdpa_device),
  68                         RTE_CACHE_LINE_SIZE);
  69         if (!dev)
  70                 return -1;
  71
  72         memcpy(&dev->addr, addr, sizeof(struct rte_vdpa_dev_addr));
  73         dev->ops = ops;
  74         vdpa_devices[i] = dev;
  75         vdpa_device_num++;
  76
  77         return i;
  78 }
  79
  80 int
  81 rte_vdpa_unregister_device(int did)
  82 {
  83         if (did < 0 || did >= MAX_VHOST_DEVICE || vdpa_devices[did] == NULL)
  84                 return -1;
  85
  86         rte_free(vdpa_devices[did]);
  87         vdpa_devices[did] = NULL;
  88         vdpa_device_num--;
  89
  90         return did;
  91 }
  92
  93 int
  94 rte_vdpa_find_device_id(struct rte_vdpa_dev_addr *addr)
  95 {
  96         struct rte_vdpa_device *dev;
  97         int i;
  98
  99         for (i = 0; i < MAX_VHOST_DEVICE; ++i) {
 100                 dev = vdpa_devices[i];
 101                 if (dev && is_same_vdpa_device(&dev->addr, addr))
 102                         return i;
 103         }
 104
 105         return -1;
 106 }
 107
 108 struct rte_vdpa_device *
 109 rte_vdpa_get_device(int did)
 110 {
 111         if (did < 0 || did >= MAX_VHOST_DEVICE)
 112                 return NULL;
 113
 114         return vdpa_devices[did];
 115 }