lib/librte_eal/linux/eal_vfio_mp_sync.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2018 Intel Corporation
   3  */
   4
   5 #include <unistd.h>
   6 #include <string.h>
   7
   8 #include <rte_compat.h>
   9 #include <rte_errno.h>
  10 #include <rte_log.h>
  11 #include <rte_vfio.h>
  12 #include <rte_eal.h>
  13
  14 #include "eal_vfio.h"
  15
  16 /**
  17  * @file
  18  * VFIO socket for communication between primary and secondary processes.
  19  *
  20  * This file is only compiled if CONFIG_RTE_EAL_VFIO is set to "y".
  21  */
  22
  23 #ifdef VFIO_PRESENT
  24
  25 static int
  26 vfio_mp_primary(const struct rte_mp_msg *msg, const void *peer)
  27 {
  28         int fd = -1;
  29         int ret;
  30         struct rte_mp_msg reply;
  31         struct vfio_mp_param *r = (struct vfio_mp_param *)reply.param;
  32         const struct vfio_mp_param *m =
  33                 (const struct vfio_mp_param *)msg->param;
  34
  35         if (msg->len_param != sizeof(*m)) {
  36                 RTE_LOG(ERR, EAL, "vfio received invalid message!\n");
  37                 return -1;
  38         }
  39
  40         memset(&reply, 0, sizeof(reply));
  41
  42         switch (m->req) {
  43         case SOCKET_REQ_GROUP:
  44                 r->req = SOCKET_REQ_GROUP;
  45                 r->group_num = m->group_num;
  46                 fd = rte_vfio_get_group_fd(m->group_num);
  47                 if (fd < 0)
  48                         r->result = SOCKET_ERR;
  49                 else if (fd == 0)
  50                         /* if VFIO group exists but isn't bound to VFIO driver */
  51                         r->result = SOCKET_NO_FD;
  52                 else {
  53                         /* if group exists and is bound to VFIO driver */
  54                         r->result = SOCKET_OK;
  55                         reply.num_fds = 1;
  56                         reply.fds[0] = fd;
  57                 }
  58                 break;
  59         case SOCKET_REQ_CONTAINER:
  60                 r->req = SOCKET_REQ_CONTAINER;
  61                 fd = rte_vfio_get_container_fd();
  62                 if (fd < 0)
  63                         r->result = SOCKET_ERR;
  64                 else {
  65                         r->result = SOCKET_OK;
  66                         reply.num_fds = 1;
  67                         reply.fds[0] = fd;
  68                 }
  69                 break;
  70         case SOCKET_REQ_DEFAULT_CONTAINER:
  71                 r->req = SOCKET_REQ_DEFAULT_CONTAINER;
  72                 fd = vfio_get_default_container_fd();
  73                 if (fd < 0)
  74                         r->result = SOCKET_ERR;
  75                 else {
  76                         r->result = SOCKET_OK;
  77                         reply.num_fds = 1;
  78                         reply.fds[0] = fd;
  79                 }
  80                 break;
  81         case SOCKET_REQ_IOMMU_TYPE:
  82         {
  83                 int iommu_type_id;
  84
  85                 r->req = SOCKET_REQ_IOMMU_TYPE;
  86
  87                 iommu_type_id = vfio_get_iommu_type();
  88
  89                 if (iommu_type_id < 0)
  90                         r->result = SOCKET_ERR;
  91                 else {
  92                         r->iommu_type_id = iommu_type_id;
  93                         r->result = SOCKET_OK;
  94                 }
  95                 break;
  96         }
  97         default:
  98                 RTE_LOG(ERR, EAL, "vfio received invalid message!\n");
  99                 return -1;
 100         }
 101
 102         strcpy(reply.name, EAL_VFIO_MP);
 103         reply.len_param = sizeof(*r);
 104
 105         ret = rte_mp_reply(&reply, peer);
 106         if (m->req == SOCKET_REQ_CONTAINER && fd >= 0)
 107                 close(fd);
 108         return ret;
 109 }
 110
 111 int
 112 vfio_mp_sync_setup(void)
 113 {
 114         if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
 115                 int ret = rte_mp_action_register(EAL_VFIO_MP, vfio_mp_primary);
 116                 if (ret && rte_errno != ENOTSUP)
 117                         return -1;
 118         }
 119
 120         return 0;
 121 }
 122
 123 #endif