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/*-
* BSD LICENSE
*
* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* All rights reserved.
*
* 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 Intel Corporation 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 THE COPYRIGHT
* OWNER OR CONTRIBUTORS 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 <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <limits.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <rte_log.h>
#include "guest_channel.h"
#include "channel_commands.h"
#define RTE_LOGTYPE_GUEST_CHANNEL RTE_LOGTYPE_USER1
static int global_fds[RTE_MAX_LCORE];
int
guest_channel_host_connect(const char *path, unsigned lcore_id)
{
int flags, ret;
struct channel_packet pkt;
char fd_path[PATH_MAX];
int fd = -1;
if (lcore_id >= RTE_MAX_LCORE) {
RTE_LOG(ERR, GUEST_CHANNEL, "Channel(%u) is out of range 0...%d\n",
lcore_id, RTE_MAX_LCORE-1);
return -1;
}
/* check if path is already open */
if (global_fds[lcore_id] != 0) {
RTE_LOG(ERR, GUEST_CHANNEL, "Channel(%u) is already open with fd %d\n",
lcore_id, global_fds[lcore_id]);
return -1;
}
snprintf(fd_path, PATH_MAX, "%s.%u", path, lcore_id);
RTE_LOG(INFO, GUEST_CHANNEL, "Opening channel '%s' for lcore %u\n",
fd_path, lcore_id);
fd = open(fd_path, O_RDWR);
if (fd < 0) {
RTE_LOG(ERR, GUEST_CHANNEL, "Unable to to connect to '%s' with error "
"%s\n", fd_path, strerror(errno));
return -1;
}
flags = fcntl(fd, F_GETFL, 0);
if (flags < 0) {
RTE_LOG(ERR, GUEST_CHANNEL, "Failed on fcntl get flags for file %s\n",
fd_path);
goto error;
}
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0) {
RTE_LOG(ERR, GUEST_CHANNEL, "Failed on setting non-blocking mode for "
"file %s", fd_path);
goto error;
}
/* QEMU needs a delay after connection */
sleep(1);
/* Send a test packet, this command is ignored by the host, but a successful
* send indicates that the host endpoint is monitoring.
*/
pkt.command = CPU_POWER_CONNECT;
global_fds[lcore_id] = fd;
ret = guest_channel_send_msg(&pkt, lcore_id);
if (ret != 0) {
RTE_LOG(ERR, GUEST_CHANNEL, "Error on channel '%s' communications "
"test: %s\n", fd_path, strerror(ret));
goto error;
}
RTE_LOG(INFO, GUEST_CHANNEL, "Channel '%s' is now connected\n", fd_path);
return 0;
error:
close(fd);
global_fds[lcore_id] = 0;
return -1;
}
int
guest_channel_send_msg(struct channel_packet *pkt, unsigned lcore_id)
{
int ret, buffer_len = sizeof(*pkt);
void *buffer = pkt;
if (lcore_id >= RTE_MAX_LCORE) {
RTE_LOG(ERR, GUEST_CHANNEL, "Channel(%u) is out of range 0...%d\n",
lcore_id, RTE_MAX_LCORE-1);
return -1;
}
if (global_fds[lcore_id] == 0) {
RTE_LOG(ERR, GUEST_CHANNEL, "Channel is not connected\n");
return -1;
}
while (buffer_len > 0) {
ret = write(global_fds[lcore_id], buffer, buffer_len);
if (ret == buffer_len)
return 0;
if (ret == -1) {
if (errno == EINTR)
continue;
return errno;
}
buffer = (char *)buffer + ret;
buffer_len -= ret;
}
return 0;
}
void
guest_channel_host_disconnect(unsigned lcore_id)
{
if (lcore_id >= RTE_MAX_LCORE) {
RTE_LOG(ERR, GUEST_CHANNEL, "Channel(%u) is out of range 0...%d\n",
lcore_id, RTE_MAX_LCORE-1);
return;
}
if (global_fds[lcore_id] == 0)
return;
close(global_fds[lcore_id]);
global_fds[lcore_id] = 0;
}
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