lib/librte_eal/linuxapp/eal/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_log.h>
  10 #include <rte_vfio.h>
  11 #include <rte_eal.h>
  12
  13 #include "eal_vfio.h"
  14
  15 /**
  16  * @file
  17  * VFIO socket for communication between primary and secondary processes.
  18  *
  19  * This file is only compiled if CONFIG_RTE_EAL_VFIO is set to "y".
  20  */
  21
  22 #ifdef VFIO_PRESENT
  23
  24 static int
  25 vfio_mp_primary(const struct rte_mp_msg *msg, const void *peer)
  26 {
  27         int fd = -1;
  28         int ret;
  29         struct rte_mp_msg reply;
  30         struct vfio_mp_param *r = (struct vfio_mp_param *)reply.param;
  31         const struct vfio_mp_param *m =
  32                 (const struct vfio_mp_param *)msg->param;
  33
  34         if (msg->len_param != sizeof(*m)) {
  35                 RTE_LOG(ERR, EAL, "vfio received invalid message!\n");
  36                 return -1;
  37         }
  38
  39         memset(&reply, 0, sizeof(reply));
  40
  41         switch (m->req) {
  42         case SOCKET_REQ_GROUP:
  43                 r->req = SOCKET_REQ_GROUP;
  44                 r->group_num = m->group_num;
  45                 fd = rte_vfio_get_group_fd(m->group_num);
  46                 if (fd < 0)
  47                         r->result = SOCKET_ERR;
  48                 else if (fd == 0)
  49                         /* if VFIO group exists but isn't bound to VFIO driver */
  50                         r->result = SOCKET_NO_FD;
  51                 else {
  52                         /* if group exists and is bound to VFIO driver */
  53                         r->result = SOCKET_OK;
  54                         reply.num_fds = 1;
  55                         reply.fds[0] = fd;
  56                 }
  57                 break;
  58         case SOCKET_REQ_CONTAINER:
  59                 r->req = SOCKET_REQ_CONTAINER;
  60                 fd = rte_vfio_get_container_fd();
  61                 if (fd < 0)
  62                         r->result = SOCKET_ERR;
  63                 else {
  64                         r->result = SOCKET_OK;
  65                         reply.num_fds = 1;
  66                         reply.fds[0] = fd;
  67                 }
  68                 break;
  69         default:
  70                 RTE_LOG(ERR, EAL, "vfio received invalid message!\n");
  71                 return -1;
  72         }
  73
  74         strcpy(reply.name, EAL_VFIO_MP);
  75         reply.len_param = sizeof(*r);
  76
  77         ret = rte_mp_reply(&reply, peer);
  78         if (m->req == SOCKET_REQ_CONTAINER && fd >= 0)
  79                 close(fd);
  80         return ret;
  81 }
  82
  83 int
  84 vfio_mp_sync_setup(void)
  85 {
  86         if (rte_eal_process_type() == RTE_PROC_PRIMARY)
  87                 return rte_mp_action_register(EAL_VFIO_MP, vfio_mp_primary);
  88
  89         return 0;
  90 }
  91
  92 #endif