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/*
* Copyright (c) 2020 Nutanix Inc. All rights reserved.
*
* Authors: Thanos Makatos <thanos@nutanix.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Nutanix nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*/
#include <stdio.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/mman.h>
#include "../lib/muser.h"
#include "../lib/muser_priv.h"
#include "../lib/common.h"
static int
init_sock(const char *path)
{
int ret, sock;
struct sockaddr_un addr = {.sun_family = AF_UNIX};
/* TODO path should be defined elsewhere */
ret = snprintf(addr.sun_path, sizeof addr.sun_path, path);
if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
perror("failed to open socket");
return sock;
}
if ((ret = connect(sock, (struct sockaddr*)&addr, sizeof(addr))) == -1) {
perror("failed to connect server");
return ret;
}
return sock;
}
static int
map_dma(int sock)
{
struct vfio_user_header hdr = {.msg_id = 1, .cmd = VFIO_USER_DMA_MAP};
}
static int
set_version(int sock)
{
int ret, mj, mn;
uint16_t msg_id;
ret = recv_version(sock, &mj, &mn, &msg_id, false);
if (ret < 0) {
fprintf(stderr, "failed to receive version from server: %s\n",
strerror(-ret));
return ret;
}
if (mj != LIB_MUSER_VFIO_USER_VERS_MJ || mn != LIB_MUSER_VFIO_USER_VERS_MN) {
fprintf(stderr, "bad server version %d.%d\n", mj, mn);
return -EINVAL;
}
ret = send_version(sock, mj, mn, msg_id, true);
if (ret < 0) {
fprintf(stderr, "failed to send version to server: %s\n",
strerror(-ret));
return ret;
}
return 0;
}
int main(int argc, char *argv[])
{
int ret, sock;
char template[] = "XXXXXX";
struct vfio_user_dma_region dma_regions[2];
int dma_region_fds[ARRAY_SIZE(dma_regions)];
struct vfio_user_header hdr;
uint16_t msg_id;
if (argc != 2) {
fprintf(stderr, "usage: %s /path/to/socket\n", argv[0]);
return -1;
}
if ((sock = init_sock(argv[1])) < 0) {
return sock;
}
/*
* The server proposes version upon connection, we need to send back the
* version the version we support.
*/
if ((ret = set_version(sock)) < 0) {
return ret;
}
/* Tell the server we have a memory DMA region it can access. */
if ((dma_region_fds[0] = mkstemp(template)) == -1) {
perror("failed to create DMA file");
return -1;
}
if ((ret = ftruncate(dma_region_fds[0], 2 * sysconf(_SC_PAGESIZE))) == -1) {
perror("failed to truncate file");
return -1;
}
dma_regions[0].addr = 0xdeadbeef;
dma_regions[0].size = sysconf(_SC_PAGESIZE);
dma_regions[0].offset = 0;
dma_regions[0].prot = PROT_READ | PROT_WRITE;
dma_regions[0].flags = VFIO_USER_F_DMA_REGION_MAPPABLE;
dma_regions[1].addr = 0xcafebabe;
dma_regions[1].size = sysconf(_SC_PAGESIZE);
dma_regions[1].offset = dma_regions[0].size;
dma_regions[1].prot = PROT_READ | PROT_WRITE;
dma_regions[1].flags = VFIO_USER_F_DMA_REGION_MAPPABLE;
dma_region_fds[1] = dma_region_fds[0];
msg_id = 1;
ret = send_vfio_user_msg(sock, msg_id, false, VFIO_USER_DMA_MAP, dma_regions,
sizeof(dma_regions), dma_region_fds,
ARRAY_SIZE(dma_region_fds));
if (ret < 0) {
fprintf(stderr, "failed to send DMA regions: %s\n", strerror(-ret));
return ret;
}
ret = recv_vfio_user_msg(sock, &hdr, true, &msg_id);
if (ret < 0) {
fprintf(stderr, "failed to receive response for mapping DMA regions: %s\n",
strerror(-ret));
return ret;
}
return 0;
}
/* ex: set tabstop=4 shiftwidth=4 softtabstop=4 expandtab: */
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